SEGMENTS AND GEOGRAPHIC INFORMATION [Abstract] -- None. No documentation exists for this element. -- SEGMENTS, GEOGRAPHIC INFORMATION AND SIGNIFICANT CUSTOMERS Segment Reporting Disclosure [Text Block] RECENT BUSINESS COMBINATIONS [Abstract] RECENT BUSINESS COMBINATIONS [Abstract] Business Combinations, Pro Forma Results [Table] Business Combinations, Pro Forma Results [Table] Business Combinations, Pro Forma Results [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Investopedia Com Acquisition [Member] Investopedia Com Acquisition [Member] Investopedia Acquisition [Member] Greystripe Inc Acquisition [Member] Greystripe Inc Acquisition [Member] Greystripe Inc Acquisition [Member] Dotomi Inc [Member] Dotomi Inc [Member] Dotomi Inc [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Revenue Business Acquisition, Pro Forma Revenue Net income Business Acquisition, Pro Forma Net Income (Loss) Basic net income per common share Business Acquisition, Pro Forma Earnings Per Share, Basic Diluted net income per common share Business Acquisition, Pro Forma Earnings Per Share, Diluted INCOME TAXES [Abstract] INCOME TAXES [Abstract] United States Income (Loss) from Continuing Operations before Income Taxes, Domestic Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Marketable Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Marketable securities Available-for-sale Securities, Current Marketable securities sale proceeds Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds Realized gains (losses) Available-for-sale Securities, Gross Realized Gain (Loss) Realized losses Available-for-sale Securities, Gross Realized Losses Goodwill and Intangible Assets Disclosure [Abstract] GOODWILL AND INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Statement, Scenario [Axis] Statement, Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Net Income (Loss) Attributable to Parent Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization expense Depreciation, Depletion and Amortization Non-cash, stock-based compensation Share-based Compensation Provision for doubtful accounts and sales credits Provision for Doubtful Accounts and Sales Credits Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts and sales credits, for the purpose of reducing receivables to an amount that approximates their net realizable value (the amount expected to be collected), net of anticipated sales credits. Amortization of discount on note receivable Amortization of Discount on Note Receivable The amount of amortization of the discount on the note receivable, recognized in the cash flow statement for the period. Impairment of goodwill and intangible assets Goodwill, Impairment Loss Gain on sale of business, net of tax Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Realized loss on securities Marketable Securities, Realized Gain (Loss) Deferred income taxes Income Tax Expense (Benefit), Continuing Operations, Discontinued Operations, Extraordinary Items Net tax windfall (shortfall) from stock-based awards Tax Benefit from Stock Options Exercised Excess tax benefit from stock-based awards Excess Tax Benefit from Share-based Compensation, Operating Activities Changes in operating assets and liabilities, net of effects of acquisitions: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Income taxes receivable/payable Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Deferred revenue Increase (Decrease) in Deferred Revenue Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from the sales of marketable securities Proceeds from Sale of Available-for-sale Securities Proceeds from the maturities of marketable securities Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Proceeds from disposition of property and equipment Proceeds from Sale of Property, Plant, and Equipment Principal payments received on note receivable Proceeds from Collection of Notes Receivable Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Acquisition of business, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from borrowings under credit agreement Proceeds from Lines of Credit Repayments under credit agreement Repayments of Lines of Credit Proceeds from shares issued under employee stock programs Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Excess tax benefit from stock-based awards Excess Tax Benefit from Share-based Compensation, Financing Activities Repurchases and retirement of common stock Payments for Repurchase of Common Stock Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Effect of foreign currency translations Effect of Exchange Rate on Cash and Cash Equivalents Net (decrease) increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period Supplemental disclosures of cash flow Information: Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid Cash paid for income taxes, net Income Taxes Paid, Net Supplemental disclosure of non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Fair value of note receivable issued in connection with disposal of business Noncash or Part Noncash Divestiture, Amount of Consideration Received Common stock issued in connection with acquisition of business Stock Issued Fair value of stock options assumed in connection with acquisition of business Stock Options Assumed Stock Options Assumed Schedule II Valuation and Qualifying Accounts [Abstract] Schedule II Valuation and Qualifying Accounts [Abstract] Valuation and Qualifying Accounts Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Organization and Summary of Significant Accounting Policies [Abstract] Organization and Summary of Significant Accounting Policies [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Statement, Business Segments [Axis] Statement, Business Segments [Axis] Segment [Domain] Segment [Domain] Goodwill [Line Items] Goodwill [Line Items] Impairment of goodwill CREDIT AGREEMENT [Abstract] CREDIT AGREEMENT [Abstract] Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Maturities of Long-term Debt [Table Text Block] Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] Company contributions to master savings plan Defined Contribution Plan, Cost Recognized INTANGIBLE ASSETS [Abstract] INTANGIBLE ASSETS [Abstract] Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Acquired Finite-Lived Intangible Assets by Major Class [Axis] Acquired Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer affiliate and advertiser relationships [Member] Customer Affiliate and Advertiser Relationships [Member] Customer Affiliate and Advertiser Relationships [Member] Trademarks trade names and domain names [Member] Trademarks trade names and domain names [Member] Trademarks trade names and domain names [Member] Developed technologies and websites [Member] Developed technologies and websites [Member] Developed technologies and websites [Member] Covenants not to compete [Member] Noncompete Agreements [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Income Statement Location [Domain] Cost of revenue [Member] Cost of Sales [Member] Operating expenses [Member] Operating Expense [Member] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Weighted Average Useful Life Acquired Finite-lived Intangible Asset, Weighted Average Useful Life Gross Balance Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Carrying Amount Finite-Lived Intangible Assets, Net Acquired Finite-lived Intangible Asset, Amount Acquired Finite-lived Intangible Asset, Amount Write-off of a fully amortized customer relationship asset Write Off Of Fully Amortized Intangible Asset Write Off Of Fully Amortized Intangible Asset Recognized amortization expense on intangible assets Amortization of Acquired Intangible Assets Finite-Lived Intangible Assets, Future Amortization Expense [Abstract] Finite-Lived Intangible Assets, Future Amortization Expense [Abstract] 2012 Future Amortization Expense, Year One 2013 Future Amortization Expense, Year Two 2014 Future Amortization Expense, Year Three 2015 Future Amortization Expense, Year Four 2016 Future Amortization Expense, Year Five Thereafter Future Amortization Expense, after Year Five DISCONTINUED OPERATIONS DISCLOSURE [Abstract] -- None. No documentation exists for this element. -- DISCONTINUED OPERATIONS Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] NOTE RECEIVABLE [Abstract] NOTE RECEIVABLE [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts, Notes, Loans and Financing Receivable by Receivable Type [Axis] Receivable Type [Domain] Financing Receivable [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Subsidiaries [Member] Subsidiaries [Member] Subsidiary Web Marketing Holdings LLC [Member] Subsidiary Web Marketing Holdings LLC [Member] Subsidiary Web Marketing Holdings LLC [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Axis] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Axis] Disposal Groups, Including Discontinued Operations, Name [Domain] Disposal Groups, Including Discontinued Operations, Name [Domain] Web Marketing Holdings LLC [Member] Web Marketing Holdings LLC [Member] Disposal Group Web Marketing Holdings LLC [Member] Notes Receivable Sale of Business Unit [Axis] Notes Receivable Sale of Business Unit [Axis] Notes Receivable Sale of Business Unit [Axis] Receivable Sale of Business Unit [Domain] Receivable Sale of Business Unit [Domain] Receivable Sale of Business Unit [Domain] Notes Receivable Related to Web Clients [Member] Notes Receivable [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Composition of Note Receivable [Abstract] Composition of Note Receivable [Abstract] Composition of Note Receivable [Abstract] Note receivable, gross Notes, Loans and Financing Receivable, Gross Discount Receivable with Imputed Interest, Discount Note receivable, net of discount Notes Loans and Financing Receivable net of discount Notes Loans and Financing Receivable net of discount Less: current portion Notes, Loans and Financing Receivable, Net, Current Note receivable, less current portion Notes, Loans and Financing Receivable, Net, Noncurrent Note Receivable Additional Information Notes, Loans and Financing Receivable, Net [Abstract] Term of Note Receivable in Years Term of Note Receivable Term of Note Receivable Interest Rate on Note Receivable Interest Rate on Note Receivable Interest Rate on Note Receivable Term of Payment Amortization Period in Years Term of Payment Amortization Period Term of Payment Amortization Period Year Balloon Payment is Due Year Balloon Payment is Due Year Balloon Payment is Due Estimated fair value of the note receivable Notes Receivable, Fair Value Disclosure Proceeds from the sale of Web Clients Note Receivable Face Amount Note Receivable Face Amount Total interest income related to note Interest Income (Expense), Net GOODWILL AND INTANGIBLE ASSETS [Abstract] GOODWILL AND INTANGIBLE ASSETS [Abstract] Reporting Units [Member] Reporting Units [Member] Reporting Units [Member] Technology [Member] Technology [Member] Technology [Member] Affiliate Marketing [Member] Affiliate Marketing [Member] Affiliate Marketing [Member] Media [Member] Media [Member] Media [Member] Owned and Operated Websites [Member] Owned and Operated Websites [Member] Owned and Operated Websites [Member] Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Goodwill Goodwill, Gross Accumulated impairment losses Goodwill, Impaired, Accumulated Impairment Loss Goodwill Goodwill Goodwill [Roll Forward] Goodwill [Roll Forward] Balance at beginning of period Foreign currency translation adjustments Goodwill, Translation Adjustments Tax adjustments Goodwill, Other Changes Acquisition Goodwill, Acquired During Period Balance at end of period Impairment Goodwill, Percentage Estimated Fair Values Exceeded Carrying Values By Goodwill, Percentage Estimated Fair Values Exceeded Carrying Values By Goodwill, Percentage Estimated Fair Values Exceeded Carrying Values By Tax deductible goodwill Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount Commitments and Contingencies [Abstract] Commitments and Contingencies [Abstract] Unrecorded Unconditional Purchase Obligation [Table] Unrecorded Unconditional Purchase Obligation [Table] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unrecorded Unconditional Purchase Obligation [Line Items] Unrecorded Unconditional Purchase Obligation [Line Items] Purchase obligations, Total Unrecorded Unconditional Purchase Obligation Purchase obligations, Due in Less Than One Year Unrecorded Unconditional Purchase Obligation, Due within One Year Purchase obligations, Due in One Year to Less Than Three Years Unrecorded Unconditional Purchase Obligation, Due in One Year to Less Than Three Years Unrecorded Unconditional Purchase Obligation, Due in One to Less Than Three Years Purchase obligations, Due in Three Years to Less Than Five Years Unrecorded Unconditional Purchase Obligation, Due in Three Years to Less Than Five Years Unrecorded Unconditional Purchase Obligation, Due in Three Years to Less Than Five Years Purchase obligations, Due in More Than Five Years Unrecorded Unconditional Purchase Obligation, Due after Five Years NET INCOME PER COMMON SHARE [Abstract] NET INCOME PER COMMON SHARE [Abstract] Computation of basic and diluted net income per common share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Stock by Class [Table] Related Party Transactions, by Related Party [Axis] Related Party [Domain] Beneficial Owner [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Preferred Stock [Member] Series A Junior Participating Preferred Stock [Member] Series A Preferred Stock [Member] Class of Stock [Line Items] Class of Stock [Line Items] Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared, Purchase Right Common Stock, Dividends, Per Share, Declared, Purchase Right Number of Units Each Right Entitles Holder to Purchase Number of Units Each Right Entitles Holder to Purchase Number of Units Each Right Entitles Holder to Purchase Portion of Share Representing Unit The Holder is Entitled to Purchase Portion of Share Representing Unit The Holder is Entitled to Purchase Preferred Stock, Price Per Unit Preferred Stock, Price Per Unit Preferred Stock, Price Per Unit Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Number of Business Days Following Offer Which Results in Bidder Beneficial Ownership Number of Business Days Following Offer Which Results in Bidder Beneficial Ownership Number of Business Days Following Offer Which Results in Bidder Beneficial Ownership Preferred Stock, Dividends, Per Share, Number of Times the Dividend Declared Per Share of Common Stock Preferred Stock, Dividends, Per Share, Number of Times the Dividend Declared Per Share of Common Stock Preferred Stock, Dividends, Per Share, Number of Times the Dividend Declared Per Share of Common Stock Liquidation Payment, Number of Times the Payment Per Share of Common Stock Liquidation Payment, Number of Times the Payment Per Share of Common Stock Liquidation Payment, Rate Times Payment Per Share of Common Stock Preferred Stock Voting Rights Per Share Preferred Stock Voting Rights Per Share Preferred Stock Voting Rights Per Share Exchange of Stock, Number of Times the Amount Received Per Share of Common Stock Exchange of Stock, Number of Times the Amount Received Per Share of Common Stock Exchange of Stock, Number of Times the Amount Received Per Share of Common Stock Number of Rights Entitled to Holder of Unexercised Rights Number of Rights Entitled to Holder of Unexercised Rights Number of Rights Entitled to Holder of Unexercised Rights Schedule of Impaired Long-Lived Assets Held and Used [Table] Schedule of Impaired Long-Lived Assets Held and Used [Table] Impaired Long-Lived Assets Held and Used by Type [Axis] Impaired Long-Lived Assets Held and Used by Type [Axis] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Impaired Long-Lived Assets Held and Used [Line Items] Impaired Long-Lived Assets Held and Used [Line Items] Impairment of Long-Lived Assets Held-for-use Impairment of Long-Lived Assets Held-for-use Concentration Risk [Table] Concentration Risk [Table] Major Customers [Axis] Name of Major Customer [Domain] Yahoo [Member] Yahoo [Member] Google [Member] Google [Member] Concentration Risk by Benchmark [Axis] Concentration Risk by Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Accounts Receivable [Member] Total Revenue [Member] Total Revenue [Member] Concentration Risk by Type [Axis] Concentration Risk by Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Number of Major Customers Number of Major Customers Number of Major Customers Concentration Risk, Percentage Concentration Risk, Percentage Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain] Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain] Stock Options [Member] Stock Options [Member] Aggregate Purchase Price Business Acquisition, Cost of Acquired Entity, Purchase Price Business Acquisition, Cost of Acquired Entity, Cash Paid Business Acquisition, Cost of Acquired Entity, Cash Paid Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Business Acquisition Equity Interest Issued or Issuable Value Assumed Business Acquisition Equity Interest Issued or Issuable Value Assumed Business Acquisition Equity Interest Issued or Issuable Value Assumed Business Acquisition Unvested Restricted Stock Assumed, Shares Business Acquisition Unvested Restricted Stock Assumed, Shares Business Acquisition Unvested Restricted Stock Assumed, Shares Business Acquisition Unvested Stock Options Assumed, Shares Business Acquisition Unvested Stock Options Assumed, Shares Business Acquisition Unvested Stock Options Assumed, Shares Stock Issued During Period, Value, Acquisitions Stock Issued During Period, Value, Acquisitions Transaction Costs incurred Business Acquisition, Cost of Acquired Entity, Transaction Costs Noncompete Agreements [Member] Cash Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents Accounts receivable and other assets Business Acquisition Purchase Price Allocation Accounts receivable and other assets acquired Business Acquisition Purchase Price Allocation Accounts receivable and other assets acquired Deferred tax assets Deferred Tax Assets, Gross Property and equipment Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment Useful Life Acquired Finite-lived Intangible Asset, Amount Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets Goodwill Business Acquisition, Purchase Price Allocation, Goodwill Amount Total assets acquired Business Acquisition, Purchase Price Allocation, Assets Acquired Deferred tax liability Deferred Tax Liabilities Income taxes payable Taxes Payable Other liabilities assumed Business Acquisition, Purchase Price Allocation, Liabilities Assumed Total Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net STOCK BASED COMPENSATION [Abstract] STOCK-BASED COMPENSATION [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Restricted Stock [Member] Deferred Compensation Arrangement with Individual, Share-based Payments, by Title of Individual [Axis] Deferred Compensation Arrangement with Individual, Share-based Payments, by Title of Individual [Axis] Title of Individual with Relationship to Entity [Domain] Title of Individual with Relationship to Entity [Domain] Director [Member] Director [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value Amount Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value Amount Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value Amount Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Weighted Average Remaining Vesting Period Employee Service Share-based Compensation, Nonvested Awards, Weighted Average Remaining Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] Unvested, Beginning Balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Assumed awards from business combinations Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Assumed Awards Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Assumed Awards Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Unvested, Ending Balance Unvested, weighted-average grant date fair value, Beginning of Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted, weighted-average grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Assumed awards from business combinations, weighted-average grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Assumed Awards, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Assumed Awards, Weighted Average Grant Date Fair Value Vested, weighted-average grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited, weighted-average grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value Unvested, weighted-average grant date fair value, End of Period NET INCOME PER COMMON SHARE DISCLOSURE [Abstract] -- None. No documentation exists for this element. -- NET INCOME PER COMMON SHARE Earnings Per Share [Text Block] ASSETS ACQUIRED AND LIABILITIES ASSUMED AS PART OF BUSINESS COMBINATION [Abstract] INTANGIBLE ASSETS ACQUIRED AS PART OF BUSINESS COMBINATION [Abstract] Deferred Tax Liabilities Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Marketable Securities, Unrealized Gain (Loss) Marketable Securities, Unrealized Gain (Loss) Line of Credit Facility [Table] Line of Credit Facility [Table] Variable Interest by Type [Axis] Variable Interest by Type [Axis] Variable Interest by Type [Axis] Variable Interest by Type [Domain] Variable Interest by Type [Domain] Variable Interest by Type [Domain] Federal Funds [Member] Federal Funds [Member] Federal Funds [Member] LIBOR [Member] LIBOR [Member] LIBOR [Member] Line of Credit Facility [Axis] Line of Credit Facility [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Bank Group [Member] Bank Group [Member] Bank Group [Member] Term Loan [Member] Term Loan [Member] Term Loan Portion of Total Credit Facility Borrowings [Member] Borrowings [Member] Swap [Member] Swap [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Revolving Credit, Value Line of Credit Facility, Current Borrowing Capacity Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Line of Credit Facility, Interest Rate Description Line of Credit Facility, Interest Rate Description Applicable margin range, minimum - LIBOR loans Applicable Margin Range Minimum for LIBOR Loans Applicable Margin Range Minimum for LIBOR Loans Applicable margin range, maximum - LIBOR loans Applicable Margin Range Maximum for LIBOR Loans Applicable Margin Range Maximum for LIBOR Loans Applicable margin range, minimum - base rate loans Applicable Margin Range Minimum for Base Rate Loans Applicable Margin Range Minimum for Base Rate Loans Applicable margin range, maximum - base rate loans Applicable Margin Range Maximum for Base Rate Loans Applicable Margin Range Maximum for Base Rate Loans Commitment fee on unused amounts of line of credit Line of Credit Facility, Commitment Fee Percentage Amount outstanding on the Line of Credit Line of Credit Facility, Amount Outstanding Repayments of Lines of Credit Term loan maturities Maturities of Long-term Debt [Abstract] 2012 Long-term Debt, Current Maturities 2013 Long-term Debt, Maturities, Repayments of Principal in Year Two 2014 Long-term Debt, Maturities, Repayments of Principal in Year Three 2015 Long-term Debt, Maturities, Repayments of Principal in Year Four 2016 Long-term Debt, Maturities, Repayments of Principal in Year Five Financial Covenants Amount Financial Covenants Amount Financial Covenants Amount Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage CREDIT AGREEMENT Debt Disclosure [Text Block] Statement of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Accounts receivable, net of allowances of $4,731 and $3,976 as of December 31, 2011 and 2010, respectively Accounts Receivable, Net, Current Prepaid expenses and other current assets Other Assets, Current Income taxes receivable Income Taxes Receivable, Current Deferred tax assets Deferred Tax Assets, Net, Current Total current assets Assets, Current Note receivable, less current portion Notes, Loans and Financing Receivable, Gross, Noncurrent Property and equipment, net Property, Plant and Equipment, Net Goodwill Intangible assets acquired in business combinations, net Deferred tax assets, less current portion Deferred Tax Assets, Gross, Noncurrent Other assets Other Assets, Noncurrent Total assets Assets Liabilities and Stockholders' Equity Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Other current liabilities Other Liabilities, Current Short-term borrowings Line of Credit, Current Total current liabilities Liabilities, Current Income taxes payable, less current portion Liability for Uncertain Tax Positions, Noncurrent Deferred tax liabilities, less current portion Deferred Tax Liabilities, Noncurrent Borrowings under credit agreement, less current portion Long-term Line of Credit, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 17) Commitments and Contingencies Stockholders' equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Convertible preferred stock, $0.001 par value; 20,000,000 shares authorized; no shares issued or outstanding at December 31, 2011 and 2010 Preferred Stock, Value, Issued Common stock, $0.001 par value; 500,000,000 shares authorized; 80,139,493 and 80,974,145 shares issued and outstanding at December 31, 2011 and 2010, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Retained earnings (accumulated deficit) Retained Earnings (Accumulated Deficit) Total stockholders' equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Income Statement [Abstract] Revenue Revenues Cost of revenue Cost of Revenue Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Sales and marketing (includes stock-based compensation of $3,320, $1,280 and $1,907 for 2011, 2010 and 2009, respectively) Selling and Marketing Expense General and administrative (includes stock-based compensation of $7,829, $5,815 and $6,034 for 2011, 2010 and 2009, respectively) General and Administrative Expense Technology (includes stock-based compensation of $2,873, $849 and $928 for 2011, 2010 and 2009, respectively) Technology Expense The aggregate total of expenses associated with the maintenance of technology platforms, including compensation and employee benefits associated with engineering and network operations departments, and costs for contracted services and supplies. Amortization of intangible assets acquired in business combinations Amortization of Intangible Assets Total operating expenses Operating Expenses Income from operations Operating Income (Loss) Interest and other income, net Interest Income and Other, Net This element consists principally of interest earned on cash and cash equivalents and marketable securities, interest expense associated with debt obligations, and foreign currency exchange gains and/or losses. Income tax expense Income Tax Expense (Benefit), Continuing Operations Income from continuing operations Income (Loss) from Continuing Operations Attributable to Parent Discontinued operations (Note 5): DISCONTINUED OPERATIONS [Abstract] DISCONTINUED OPERATIONS [Abstract] (Loss) income from discontinued operations, net of tax benefit of $88 in 2010 and tax expense of $4,008 in 2009 Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Gain on sale, net of tax benefit of $8,944 Net income from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net income Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in market value of marketable securities, net of tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Basic net income per common share: Earnings Per Share, Basic [Abstract] Continuing operations Income (Loss) from Continuing Operations, Per Basic Share Discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share Net income Earnings Per Share, Basic Diluted net income per common share: Earnings Per Share, Diluted [Abstract] Continuing operations Income (Loss) from Continuing Operations, Per Diluted Share Discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share Net income Earnings Per Share, Diluted Weighted-average shares used to calculate net income per common share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted Income Tax Contingency [Table] Income Tax Contingency [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Federal, State and Foreign Income Tax Authorities [Domain] Income Tax Authority [Domain] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized Tax Benefits, Beginning Balance Unrecognized Tax Benefits Additions based on tax positions related to the current year Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions Additions for tax positions of prior years Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions Acquired unrecognized tax benefits Unrecognized Tax Benefits, Increases Resulting from Acquisition Unrecognized Tax Benefits, Increases Resulting from Acquisition Settlements with tax authorities Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities Reductions as a result of lapse of applicable statute of limitations Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations Reductions for tax positions of prior years Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions Unrecognized Tax Benefits, Ending Balance Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Recognized gross interest and penalties expense related to uncertain tax positions Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Reversal of prior accrued interest expense related to unrecognized tax benefits Tax Adjustments, Settlements, and Unusual Provisions Assumed gross interest and penalties related to acquired unrecognized tax benefits Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Assumed In Acquisition Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Assumed In Acquisition Accrued liability for interest and penalities related to uncertain tax positions Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Loss Contingencies [Table] Loss Contingencies by Nature of Contingency [Axis] Loss Contingency, Nature [Domain] Standby Letters of Credit [Member] Loss Contingencies [Line Items] Standby Letters of Credit, Expiration Standby Letters of Credit, Expiration Standby Letters of Credit, Expiration Standby Letters of Credit, Expiration, Less Than One Year Standby Letters of Credit, Expiration, Less Than One Year Standby Letters of Credit, Expiration, Less Than One Year Standby Letters of Credit, Expiration, One Year to Less Than Three Years Standby Letters of Credit, Expiration, One Year to Less Than Three Years Standby Letters of Credit, Expiration, One Year to Less Than Three Years Standby Letters of Credit, Expiration, Three Years to Less Than Five Years Standby Letters of Credit, Expiration, Three Years to Less Than Five Years Standby Letters of Credit, Expiration, Three Years to Less Than Five Years Standby Letters of Credit, Expiration, After Five Years Standby Letters of Credit, Expiration, After Five Years Standby Letters of Credit, Expiration, After Five Years Principles of Consolidation Consolidation, Policy [Policy Text Block] Basis of Presentation and Use of Estimates Use of Estimates, Policy [Policy Text Block] Cost Reclassifications and Corrections Cost Reclassifications and Corrections [Policy Text Block] Cost Reclassifications and Corrections [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Marketable Securities Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block] Accounts Receivable and Allowance for Doubtful Accounts and Sales Credits Trade and Other Accounts Receivable, Policy [Policy Text Block] Financing Receivables Finance, Loans and Leases Receivable, Policy [Policy Text Block] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Business Combinations Business Combinations Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Long-lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Cost of Revenue Cost of Sales, Policy [Policy Text Block] Sales, Marketing, General and Administrative Selling, General and Administrative Expenses, Policy [Policy Text Block] Technology Technology Expense Policy [Policy Text Block] Technology Expense Policy [Policy Text Block] Stock-based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Foreign Currency Translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Concentration of Credit Risk and Significant Customers Concentration of Credit Risk and Significant Customers Policy [Policy Text Block] Concentration of Credit Risk and Significant Customers Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Basic and Diluted Net Income per Common Share Earnings Per Share, Policy [Policy Text Block] Business Segments Segment Reporting, Policy [Policy Text Block] Federal [Member] Internal Revenue Service (IRS) [Member] State [Member] State and Local Jurisdiction [Member] Valuation Allowance, Deferred Tax Asset, Change in Amount Valuation Allowance, Deferred Tax Asset, Change in Amount Operating Loss Carryforwards Operating Loss Carryforwards Deferred tax assets: Components of Deferred Tax Assets [Abstract] Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Depreciation and amortization Deferred Tax Assets, Property, Plant and Equipment and Intangibles Deferred Tax Assets, Property, Plant and Equipment and Intangibles Stock options Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost State tax Deferred Tax Assets, Other Tax Carryforwards Discount on Note Deferred Tax Assets, Discount on Note Deferred Tax Assets, Discount on Note Capital loss carryforward Deferred Tax Assets, Capital Loss Carryforwards Other Deferred Tax Assets, Other Gross deferred tax assets Valuation allowance Deferred Tax Assets, Valuation Allowance Net deferred tax assets Deferred Tax Assets, Net Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Acquired intangible assets Deferred Tax Liabilities, Goodwill and Intangible Assets, Intangible Assets Other Deferred Tax Liabilities, Other Total deferred tax liabilities Current portion of net deferred tax assets Long-term portion of net deferred tax assets Deferred Tax Assets, Net, Noncurrent Net deferred tax assets Deferred Tax Assets (Liabilities), Net Assigned goodwill by reporting unit Schedule of Goodwill [Table Text Block] Acquired intangible assets weighted-average useful lives Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Gross balance, accumulated amortization and net carrying amount of intangible assets Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block] Impact of amortization expense recognized Schedule of Amortization Expense of Acquired Finite-Lived Intangible Assets [Table Text Block] Schedule of Amortization Expense of Acquired Finite-Lived Intangible Assets [Table Text Block] Estimated intangible asset future amortization expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Summary of stock option activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of activity for restricted stock awards Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Impact of stock-based compensation and related income tax benefits Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Estimated fair value of stock-based award on date of grant Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] Payroll Deductions, Employee Stock Purchase Plan Allowed Stock Purchases, Percentage of Annual Eligible Compensation, Payroll Deduction, Employee Stock Purchase Plans Allowed Stock Purchases, Payroll Deduction, Percentage of Annual Eligible Compensation, Employee Stock Purchase Plans Employee Stock Purchase Plan, Shares in Plan Employee Stock Purchase Plan, Shares in Plan Employee Stock Purchase Plan, Shares in Plan Employee Stock Purchase Plan, Discount from Market Price, Lower of Offering Date or Specified Purchase Date Employee Stock Purchase Plan, Discount from Market Price, Lower of Offering Date or Specified Purchase Date Employee Stock Purchase Plan, Discount from Market Price, Lower of Offering Date or Specified Purchase Date Employee Stock Purchase Plan, Term of Offering Period Employee Stock Purchase Plan, Term of Offering Period Stock Issued During Period, Shares, Employee Stock Purchase Plans Stock Issued During Period, Shares, Employee Stock Purchase Plans Employee Stock Purchase Plan, Compensation Expense Employee Stock Purchase Plan, Compensation Expense Employee Stock Purchase Plan, Compensation Expense Employee Stock Purchase Plan, Nonvested Awards, Total Compensation Cost Not yet Recognized Employee Stock Purchase Plan, Nonvested Awards, Total Compensation Cost Not yet Recognized Employee Stock Purchase Plan, Nonvested Awards, Total Compensation Cost Not yet Recognized Employee Stock Purchase Plan, Unrecognized Compensation Costs on Employee Stock Purchase Plan, Weighted Average Period of Recognition Employee Stock Purchase Plan, Unrecognized Compensation Costs on Employee Stock Purchase Plan, Weighted Average Period of Recognition Notes Receivable [Member] Notes Loans and Financing Receivable net of discount FAIR VALUE MEASUREMENTS [Abstract] -- None. No documentation exists for this element. -- Fair Value Measurements Fair Value Disclosures [Text Block] PROPERTY AND EQUIPMENT DISCLOSURE [Abstract] -- None. No documentation exists for this element. -- PROPERTY AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value by Asset Class [Axis] Fair Value by Asset Class [Axis] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, by Asset Class [Domain] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, by Asset Class [Domain] Debt Securities [Member] Debt Securities [Member] Auction Rate Securities [Member] Auction Rate Securities [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Debt outstanding Long-term Debt, Gross Number of marketable securities held Number of Marketable Securities Held Number of Marketable Securities Held Accounts Payable and Accrued Expenses [Abstract] Accounts Payable and Accrued Expenses [Abstract] Accounts payable, including amounts due to publishers Accounts Payable, Current Advertiser deposits Customer Deposits, Current Accrued salaries and benefits Employee-related Liabilities, Current Other accrued expenses Other Accrued Liabilities, Current Total PROPERTY AND EQUIPMENT [Abstract] PROPERTY AND EQUIPMENT [Abstract] Schedule of Property, Plant and Equipment [Table] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment by Type [Axis] Property, Plant and Equipment by Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land and Building [Member] Land and Building [Member] Leasehold Improvements [Member] Leasehold Improvements [Member] Machinery and Equipment [Member] Machinery and Equipment [Member] Computer equipment and purchased software [Member] Computer Equipment [Member] Furniture and equipment [Member] Office Equipment [Member] Property and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property and equipment, gross Property, Plant and Equipment, Gross Less: accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total property and equipment, net Depreciation and amortization expense Depreciation Marketable Securities Marketable Securities [Text Block] Organization and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit) Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Foreign Deferred Foreign Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit) Income tax expense Income tax expense (benefit) attributable to discontinued operations Discontinued Operation, Tax Effect of Discontinued Operation Income tax expense (benefit) attributable to stock option grants and restricted stock awards Income Tax Effects Allocated Directly to Equity RECENT BUSINESS COMBINATIONS DISCLOSURE [Abstract] -- None. No documentation exists for this element. -- RECENT BUSINESS COMBINATIONS Business Combination Disclosure [Text Block] Property, plant and equipment Liabilities assumed Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] Business Acquisitions, Percentage Of Assets and Liabilities, Including Goodwill, Recorded At Fair Value Business Acquisitions Percentage Of Assets and Liabilities Including Goodwill Recorded At Fair Value Business Acquisitions Percentage Of Assets and Liabilities Including Goodwill Recorded At Fair Value Composition of the note receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Software Development [Member] Capitalized Computer Software, Additions Capitalized Computer Software, Additions Components of income (loss) from continuing operations before income taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Income tax expense (benefit) attributable to continuing operations Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Components of the deferred tax assets and deferred tax liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Reconciliation of unrecognized tax benefits Summary of Income Tax Contingencies [Table Text Block] Effective income tax rate reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] As Reported [Member] Scenario, Previously Reported [Member] Cost Reclassification [Member] Cost Reclassification [Member] Amortization Correction [Member] Amortization Correction [Member] Adjusted [Member] Restatement Adjustment [Member] Gross profit Selling and marketing expense Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Business Acquisition, Pro Forma Information [Table Text Block] Business Acquisition, Pro Forma Information [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Statement, Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Preferred Stock [Member] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Deficit [Member] Retained Earnings [Member] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Balance (in shares) Shares, Issued Non-cash, stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Shares issued in connection with employee stock programs Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Shares issued in connection with employee stock programs (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Issuance of shares in business combinations Issuance of shares in business combinations (in shares) Stock Issued During Period, Shares, Acquisitions Assumed options from business combinations Repurchase and retirement of common stock Stock Repurchased and Retired During Period, Value Repurchase and retirement of common stock (in shares) Stock Repurchased and Retired During Period, Shares Tax benefit (shortfall) from employee stock transactions Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Other comprehensive income (loss) Balance Balance (in shares) 1999 Stock Option Plan [Member] 1999 Stock Option Plan [Member] 2002 Stock Incentive Plan [Member] 2002 Stock Incentive Plan [Member] 2002 Stock Plan [Member] 2002 Stock Plan [Member] Amended and Restated 2002 Stock Plan [Member] Amended and Restated 2002 Stock Plan [Member] Common shares reserved for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Increased number of shares reserved for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Reserved for Issuance, Period Increase (Decrease) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Reserved for Issuance, Period Increase (Decrease) Shares available for future grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Capitalization [Abstract] Capitalization [Abstract] Capitalization Stockholders' Equity Note Disclosure [Text Block] Revenue and segment income from continuing operations Schedule of Segment Reporting Information, by Segment [Table Text Block] Reconciliation of total segment income from operations to consolidated income from operations Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Depreciation and leasehold amortization expense included in the determination of segment income from operations Schedule of Depreciation and Amortization included in Segment Income from Operations [Table Text Block] Schedule of Depreciation and Amortization included in Segment Income from Operations [Table Text Block] Company's geographic information Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Number of Business Segments Number of Business Segments Number of Business Segments INCOME TAXES DISCLOSURE [Abstract] -- None. No documentation exists for this element. -- INCOME TAXES Income Tax Disclosure [Text Block] Operating Leases, Rent Expense, Net Operating Leases, Rent Expense, Net Year Ending December 31: Operating Leases, Future Minimum Payments Due [Abstract] 2012 Operating Leases, Future Minimum Payments Due, Current 2013 Operating Leases, Future Minimum Payments, Due in Two Years 2014 Operating Leases, Future Minimum Payments, Due in Three Years 2015 Operating Leases, Future Minimum Payments, Due in Four Years 2016 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total minimum lease payments Operating Leases, Future Minimum Payments Due Operating Sublease Income Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Selling and Marketing Expense [Member] Selling and Marketing Expense [Member] General and Administrative Expense [Member] General and Administrative Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Stock-based compensation Allocated Share-based Compensation Expense Related income tax benefits Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Stock-based compensation, net of tax benefits Allocated Share-based Compensation Expense, Net of Tax Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] Tax provision based on the federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate State income taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes Effects of foreign income Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential Adjustment to valuation allowance, net of purchase accounting adjustments Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance Lapse of statute of limitations Effective Income Tax Rate Reconciliation, Lapse of Statute of Limitations Effective Income Tax Rate Reconciliation, Lapse of Statute of Limitations Other, net Effective Income Tax Rate Reconciliation, Other Adjustments Overall effective income tax rate Effective Income Tax Rate, Continuing Operations Unremitted Earnings in Foreign Investment Unremitted Earnings in Foreign Investment Unremitted Earnings in Foreign Investment Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party Transactions, by Related Party [Axis] Related Party [Domain] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Related Party Transaction, Expenses from Transactions with Related Party Related Party Transaction, Expenses from Transactions with Related Party Related Party Transaction, Ownership Percentage By Director in Related Party Company Related Party Transaction, Ownership Percentage By Director in Related Party Company Related Party Transaction, Ownership Percentage in Related Party Company Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Operating Segments [Member] Operating Segments [Member] Significant Reconciling Items [Member] Significant Reconciling Items [Member] Inter-segment revenue [Member] Intersegment Elimination [Member] Corporate [Member] Corporate [Member] Corporate [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Segment income from operations Segment Operating Income Loss Segment Operating Income Loss Total Assets Corporate expenses Corporate Expenses Corporate Expenses Stock-based compensation Stock-based Compensation, Continuing Operations Stock-based Compensation, Continuing Operations Amortization of Acquired Intangible Assets Consolidated income from operations Capital expenditures Property, Plant and Equipment, Additions Depreciation and leasehold amortization Other Depreciation and Amortization Share-based Compensation, Allocation and Classification in Financial Statements [Abstract] STOCK-BASED COMPENSATION Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Dotomi Inc and Greystripe Inc Acquisition [Member] Dotomi Inc and Greystripe Inc Acquisition [Member] Dotomi Inc and Greystripe Inc Acquisition [Member] Property and Equipment Property, Plant and Equipment [Table Text Block] Income Tax Authority [Domain] Unrecognized Tax Benefits, Measurement Resulting from Settlements with Taxing Authorities Unrecognized Tax Benefits, Measurement Resulting from Settlements with Taxing Authorities Unrecognized Tax Benefits, Measurement Resulting from Settlements with Taxing Authorities Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Segregated Financial Information [Abstract] Segregated Financial Information [Abstract] Segregated Financial Information [Abstract] Revenue Disposal Group, Including Discontinued Operation, Revenue (Loss) income before income taxes from discontinued operations Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Income tax (benefit) expense (Loss) income from discontinued operations, net of tax, before gain on sale Gain on sale, net of tax benefit of $8,944 Net income from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Tax benefit Discontinued Operation, Tax (Expense) Benefit from Provision for (Gain) Loss on Disposal Disposition Details [Abstract] Disposition Details [Abstract] Disposition Details [Abstract] Pre-tax gain generated Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected lives (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Class of Treasury Stock [Table] Class of Treasury Stock [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Increased Authorization, Share Repurchase [Member] Increased Authorization, Share Repurchase [Member] Increased Authorization, Share Repurchase [Member] Equity, Class of Treasury Stock [Axis] Equity, Class of Treasury Stock [Axis] Class of Treasury Stock [Domain] Class of Treasury Stock [Domain] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Total amount authorized for repurchases Stock Repurchase Program, Authorized Amount Shares repurchased by the Company Shares repurchased by the Company, value Stock Repurchase Program Additional Authorized Amount Stock Repurchase Program Additional Authorized Amount Stock Repurchase Program Additional Authorized Amount Remaining balance of the authorization Stock Repurchase Program, Remaining Authorized Repurchase Amount Related Party Transactions Related Party Transactions Disclosure [Text Block] NOTE RECEIVABLE DISCLOSURE [Abstract] -- None. No documentation exists for this element. -- NOTE RECEIVABLE Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Future minimum lease payments Operating Leases of Lessee Disclosure [Table Text Block] Purchase obligations Recorded Unconditional Purchase Obligations [Table Text Block] Standby letters of credit commitments Schedule of Line of Credit Facilities [Table Text Block] Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Allowance for Doubtful Accounts and Sales Credits [Member] Allowance for Doubtful Accounts and Sales Credits [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Allowance for doubtful accounts and sales credits: Movement in Valuation Allowances and Reserves [Roll Forward] Balance at Beginning of Period Valuation Allowances and Reserves, Balance Additions Charged To Expense/Against Revenue Valuation Allowances and Reserves, Charged to Cost and Expense Other Adjustments Valuation Allowances and Reserves, Adjustments Deductions Valuation Allowances and Reserves, Deductions Balance at End of Period Schedule of Earnings Per Share Basic And Diluted By Common Class [Table] Schedule of Earnings Per Share Basic And Diluted By Common Class [Table] Schedule of Earnings Per Share Basic And Diluted [Table] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock Compensation Plan [Member] Stock Compensation Plan [Member] Schedule of Earnings Per Share Basic and Diluted [Line Items] Schedule of Earnings Per Share Basic And Diluted [Line Items] Schedule of Earnings Per Share Basic And Diluted [Line Items] Numerator: Net Income (Loss) Attributable to Parent [Abstract] Income from continuing operations Income from discontinued operations Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Denominator for basic calculation-weighted-average common shares Weighted-average effect of dilutive securities Incremental Common Shares Attributable to Share-based Payment Arrangements Denominator for diluted calculation Net income per common share: Earnings Per Share [Abstract] Basic income from continuing operations Basic income from discontinued operations Basic net income Diluted income from continuing operations Diluted income from discontinued operations Diluted net income Antidilutive Securities [Abstract] Antidilutive Securities [Abstract] Antidilutive Securities [Abstract] Antidilutive shares excluded from the diluted net income per common share computation Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Commitments and Contingencies Disclosure [Abstract] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Accounts Payable and Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] GEOGRAPHIC INFORMATION [Abstract] GEOGRAPHIC INFORMATION [Abstract] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Statement, Geographical [Axis] Statement, Geographical [Axis] Segment, Geographical [Domain] Segment, Geographical [Domain] United States [Member] Segment Geographical United States [Member] Segment Geographical United States [Member] United Kingdom [Member] Segment Geographical United Kingdom [Member] Segment Geographical United Kingdom [Member] Other Countries [Member] Segment Geographical Other Countries [Member] Segment Geographical Other Countries [Member] Inter-regional eliminations [Member] Revenues from External Customer [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Income from operations Long-lived assets Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Options Assumed, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Options Assumed, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Options Assumed, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Excluding Options Assumed, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Excluding Options Assumed, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Excluding Options Assumed, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Options outstanding, beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Gross Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Assumed options from business combinations Share-based Compensation Arrangement by Share-based Payment Award, Assumed Options From Business Combinations Share-based Compensation Arrangement by Share-based Payment Award, Assumed Options From Business Combinations Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited/expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Options outstanding, ending balance Options outstanding, weighted-average exercise price beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted, weighted-average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Assumed options from business combinations, weighted-average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Assumed Options, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Assumed Options, Weighted Average Exercise Price Exercised, weighted-average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited/expired weighted-average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Options outstanding, weighted-average exercise price ending balance Options vested at December 31, 2011 and expected to vest after December 31, 2011 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Options exercisable at December 31, 2011 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Options vested at December 31, 2011 and expected to vest after December 31, 2011, weighted-average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Options exercisable at December 31, 2011, weighted-average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Options outstanding, weighted-average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options vested at December 31, 2011 and expected to vest after December 31, 2011, weighted-average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Options exercisable at December 31, 2011, weighted-average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Options outstanding, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options vested at December 31, 2011 and expected to vest after December 31, 2011, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Options exercisable at December 31, 2011, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Defined Contribution Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Advertising Expense Advertising Expense Schedule of discontinued operations related to Web Clients Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block] Computer Equipment and Purchased Software [Member] Technology Equipment [Member] Furniture and equipment [Member] Furniture and Equipment [Member] Furniture and Equipment [Member] Vehicles [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment, Useful Life, Average Property, Plant and Equipment, Useful Life, Average Property, Plant and Equipment, Useful Life, Minimum Property, Plant and Equipment, Useful Life, Minimum Property, Plant and Equipment, Useful Life, Maximum Property, Plant and Equipment, Useful Life, Maximum Accounts payable and accrued expenses Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Tax Benefit Document and Entity Information -- None. No documentation exists for this element. -- Document Information [Table] Document Information [Table] Document Information, Document [Axis] Document Information, Document [Axis] Document [Domain] Document [Domain] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date