Document and Entity Information [Abstract] Document And Entity Information [Abstract] Statement [Table] Class of Stock [Axis] Class Of Stock [Domain] Class of Stock [Domain] Common Class A [Member] Class A Common Stock [Member] Common Class B [Member] Class B Common Stock [Member] Statement [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Condensed Consolidated Balance Sheets [Abstract] Equity, Class of Treasury Stock [Axis] Class Of Treasury Stock [Domain] Class of Treasury Stock [Domain] Common Stock [Member] Common Stock [Member] Common Stock ClassA And Class B [Member] Common Stock Classa And Class B [Member] Class A And Class B [Member] Assets [Abstract] ASSETS Cash and Cash Equivalents, at Carrying Value CASH AND CASH EQUIVALENTS - End of period CASH AND CASH EQUIVALENTS - Beginning of period Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Total cash, cash equivalents, and short-term investments, Estimated Fair Market Value Short-term Investments Short-term investments Short-term Investments, Total Accounts Receivable, Net, Current Accounts receivable (net of allowance for doubtful accounts of $4,599 and $5,460 at March 31, 2012 and December 31, 2011, respectively) Accounts Receivable, Net, Current, Total Deferred commissions Deferred Commissions Current Deferred commissions Prepaid Expense, Current Prepaid expenses Prepaid Expense, Current, Total Other Assets, Current Other current assets Assets, Current Total current assets Total current assets Property, Plant and Equipment, Net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property and equipment, net Property and equipment, net Goodwill Goodwill-September 30, 2011 Goodwill-December 31, 2010 Goodwill Goodwill, Total Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Intangible Assets, Net (Excluding Goodwill), Total Other Assets, Noncurrent Other assets Other Assets, Noncurrent, Total Assets TOTAL ASSETS Liabilities and Equity [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Accounts Payable, Current Accounts payable Accounts Payable, Current, Total Accrued Liabilities, Current Accrued liabilities Total Deferred Revenue, Current Deferred revenue Deferred Revenue, Current, Total Liabilities, Current Total current liabilities Deferred Tax Liabilities, Noncurrent DEFERRED TAX LIABILITIES Other Liabilities, Noncurrent OTHER LONG TERM LIABILITIES Other Liabilities, Noncurrent, Total Liabilities Total liabilities Commitments and Contingencies, COMMITMENTS AND CONTINGENCIES (Note 10) Stockholders' Equity Attributable to Parent [Abstract] STOCKHOLDERS' EQUITY (Note 11): Common Stock, Value, Issued Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Class A and Class B common stock Common Stock, Value, Issued, Total Additional Paid in Capital Additional Paid in Capital, Ending Balance Additional Paid in Capital, Beginning Balance Additional paid-in capital Additional Paid in Capital, Total Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Accumulated earnings Retained Earnings (Accumulated Deficit), Total Stockholders' Equity Attributable to Parent BALANCE BALANCE Total stockholders' equity Liabilities and Equity TOTAL LIABILITIES STOCKHOLDERS' EQUITY Allowance for Doubtful Accounts Receivable, Current Allowance for Doubtful Accounts Receivable, Current, Ending Balance Allowance for Doubtful Accounts Receivable, Current, Beginning Balance Accounts receivable, allowance for doubtful accounts Condensed Consolidated Statements Of Operations [Abstract] Revenues Net revenue Revenues, Total Costs and expenses: The aggregate cost of goods produced and sold and services rendered during the reporting period exclusive of depreciation and amortization. Cost of Revenue Exclusive of Depreciation and Amortization Cost of revenue (exclusive of depreciation and amortization shown separately below) Selling and Marketing Expense Sales and marketing Selling and Marketing Expense, Total Research and Development Expense Product development Research and Development Expense, Total General and Administrative Expense General and administrative General and Administrative Expense, Total Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction, Total Costs and Expenses Total costs and expenses Operating Income (Loss) Income (loss) from operations Income from operations Nonoperating Income (Expense) Other income (expense), net Other income, net Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income (loss) before income taxes Income before income taxes Income Tax Expense (Benefit) Income tax expense Income Tax Expense (Benefit), Total Provision (benefit) for income taxes Net Income (Loss) Attributable to Parent Net income Net income Net income Net Income (Loss) Available to Common Stockholders, Basic Net income attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic, Total Allocation of distributed earnings attributable to common stockholders Income Per Share [Abstract] Net income per share attributable to common stockholders: Earnings Per Share, Basic Basic Earnings Per Share, Basic, Total Basic net income (loss) per share Earnings Per Share, Diluted Diluted Earnings Per Share, Diluted, Total Diluted net income (loss) per share Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted-average shares used to compute net income per share attributable to common stockholders: Number of shares used in basic calculation Basic Weighted Average Number of Shares Outstanding, Basic, Total Weighted-average common shares outstanding Weighted Average Number of Shares Outstanding, Diluted Diluted Weighted Average Number of Shares Outstanding, Diluted, Total Number of shares used in diluted calculation Condensed Consolidated Statement Of Comprehensive Income [Abstract] Other comprehensive income, net: Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Change in unrealized gain on investments, net Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax Less: reclassification adjustment for net gains included in net income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total other comprehensive income, net Other Comprehensive Income (Loss), Net of Tax Comprehensive income Condensed Consolidated Statements Of Cash Flows [Abstract] OPERATING ACTIVITIES: Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to reconcile net income to net cash provided by operating activities: Provision for doubtful accounts and sales returns Provision for Doubtful Accounts and Sales Returns Provision (benefit) for doubtful accounts and sales returns Share-based Compensation Stock-based compensation Share-based Compensation, Total Excess Tax Benefit from Share-based Compensation, Operating Activities Excess income tax benefit from the exercise of stock options Excess income tax benefit from the exercise of stock options Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Accounts receivable Increase (decrease) in deferred commissions Increase (Decrease) in Deferred commissions Deferred commissions Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets, Total Increase (Decrease) in Accounts Payable and Other Operating Liabilities Accounts payable and other liabilities Increase (Decrease) in Income Taxes Income taxes, net Increase (Decrease) in Deferred Revenue Deferred revenue Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities INVESTING ACTIVITIES: Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment, Total Payments to Acquire Investments Purchases of investments Purchases of investments Payments to Acquire Investments, Total Proceeds from Maturities, Prepayments and Calls of Short-term Investments Maturities of investments Payments to Acquire Businesses, Net of Cash Acquired Payments for intangible assets and acquisitions, net of cash acquired Cash paid for acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired, Total Increase (Decrease) in Restricted Cash Changes in deposits (Increase) decrease in restricted cash Increase (Decrease) in Restricted Cash, Total (Increase) decrease in restricted cash and deposits Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities FINANCING ACTIVITIES: Proceeds from Issuance of Common Stock Proceeds from issuance of common stock The cash inflow associated with the amount received from holders early exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. Proceeds From Stock Options Early Exercised Proceeds from early exercise of employee stock options Payments for Deferred Offering Costs Payments for Deferred Offering Costs Payments for deferred offering costs Excess Tax Benefit from Share-based Compensation, Financing Activities Excess income tax benefit from the exercise of stock options Payments for Repurchase of Common Stock Repurchase of common stock Repurchase of common stock Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Effect of Exchange Rate on Cash and Cash Equivalents EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS Effect of Exchange Rate on Cash and Cash Equivalents, Total Cash and Cash Equivalents, Period Increase (Decrease) CHANGE IN CASH AND CASH EQUIVALENTS SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES: SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES: Purchases of property and equipment recorded in accounts payable and accrued liabilities Purchases of Property and Equipment Recorded in Accounts Payable and Accrued Liabilities Purchases of property and equipment recorded in accounts payable and accrued liabilities Deferred offering costs not yet paid Deferred offering costs not yet paid Deferred offering costs not yet paid Vesting of early exercised stock options Vesting of Early Exercised Stock Options Vesting of early exercised stock options Description Of Business And Basis Of Presentation [Abstract] Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Description Of Business And Basis Of Presentation Fair Value Measurements [Abstract] Fair Value Disclosures [Text Block] Fair Value Measurements Acquisitions [Abstract] Business Combination Disclosure [Text Block] Acquisitions Cash And Investments [Abstract] Cash, Cash Equivalents, and Short-term Investments [Text Block] Cash And Investments Property And Equipment [Abstract] Property, Plant and Equipment Disclosure [Text Block] Property And Equipment Goodwill And Other Intangible Assets [Abstract] Goodwill and Intangible Assets Disclosure [Text Block] Goodwill And Other Intangible Assets Accrued Liabilities [Abstract] Accrued Liabilities Disclosure [Text Block] Accrued Liabilities Disclosure [Text Block] Accrued Liabilities Other Income, Net [Abstract] Other Income and Other Expense Disclosure [Text Block] Other Income, Net Earnings Per Share [Text Block] Income Per Share Commitments And Contingencies [Abstract] Commitments and Contingencies' Disclosure [Text Block]. Commitments And Contingencies Stockholders' Equity [Abstract] Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Income Taxes [Abstract] Income Tax Disclosure [Text Block] Income Taxes Information About Revenue And Geographic Areas [Abstract] SegmentReportingDisclosureTextBlock Information About Revenue And Geographic Areas Employee Benefit Plan [Abstract] Pension and Other Postretirement Benefits Disclosure [Text Block] Employee Benefit Plan Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events