Document and Entity Information [Abstract] Document And Entity Information [Abstract] Statement [Table] 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 Statements Of Financial Condition [Abstract] Assets Cash and Cash Equivalents Cash and Cash Equivalents Cash and Cash Equivalents, End of Period Cash and Cash Equivalents, Beginning of Period Cash Held by Blackstone Funds and Other Cash and Cash Equivalents Cash Held by Blackstone Funds and Other Cash held by Funds and Other represents cash and cash equivalents held by consolidated Funds and other consolidated entities. Such amounts are not available to fund the general liquidity needs. Cash Held By Funds And Other Cash Held by Blackstone Funds and Other Cash Held by Blackstone Funds and Other Investments ($8,192,327) Investments ($7,655,958) Investments Total Investments of Consolidated Blackstone Funds Investments (including assets pledged of $187,884 and $101,298 at March 31, 2012 and December 31, 2011, respectively) Receivables Accounts Receivable ($41,148) Accounts Receivable Accounts Receivable Reverse Repurchase Agreements Reverse Repurchase Agreements Due from Affiliates ($62,227) Due from Affiliates Due from Affiliates, total Due from Affiliates Intangible Assets Net Excluding Goodwill Intangible Assets, Net Finite-Lived Intangible Assets, Net, Total Intangible Assets, Net Goodwill Goodwill, Ending Balance Goodwill, Beginning Balance Goodwill, carrying value Goodwill, Total Goodwill allocated to each of the Partnership's segments Other Assets, Total Other Assets ($19,925) Other Assets, Total Other Assets Deferred Tax Assets Deferred Tax Assets, Net, Total Total Assets Assets Total Assets Liabilities and Partners' Capital Liabilities Loans Payable ($6,154,179) Loans Payable Loans Payable Due To Related Parties Current And Noncurrent Due to Affiliates Due to Affiliates, total Due to Affiliates ($307,279) Employee Related Liabilities Current And Noncurrent Accrued Compensation and Benefits Employee-related Liabilities, Total SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased Securities Sold, Not Yet Purchased Securities Sold, Not Yet Purchased Securities Sold under Agreements to Repurchase Repurchase Agreements Accounts Payable, Accrued Expenses and Other Liabilities ($388,606) Accounts Payable, Accrued Expenses and Other Accounts Payable, Accrued Expenses and Other Accounts Payable, Accrued Expenses and Other Liabilities Total Liabilities Liabilities Total Liabilities Commitments and Contingencies 2009 Commitments and Contingencies Temporary Equity Redemption Value Funds Redeemable Non-Controlling Interests in Consolidated Entities Redeemable Noncontrolling Interest, Equity, Fair Value, Total Partners' Capital [Abstract] Partners' Capital Limited Partners' Capital Account Partners' Capital (common units: 416,092,022 issued and outstanding as of December 31, 2010; 319,939,772 issued and outstanding as of December 31, 2009) Limited Partners' Capital Account, Total Partners' Capital (common units: 504,801,275 issued and outstanding as of March 31, 2012; 489,430,907 issued and outstanding as of December 31, 2011) Retained Earnings, Appropriated Appropriated Partners' Capital Accumulated Other Comprehensive Income (Loss) 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) Non-Controlling Interests In Consolidated Entities Non-Controlling Interests in Consolidated Entities Non-Controlling Interests in Partnerships Non Controlling Interest In Partnerships Non-Controlling Interests in Blackstone Holdings Total Partners' Capital Balance Balance Total Partners' Capital Total Liabilities and Partners' Capital Total Liabilities and Partners' Capital Legal Entity [Axis] Entity [Domain] Entity [Domain] Blackstone Funds And Other Vies Voes [Member] Blackstone Funds And Other Vies Voes [Member] Blackstone Funds And Other [Member] Pledged Assets Separately Reported Securities At Fair Value Pledged As Collateral Investment assets pledged Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value, Total Partner's Capital, common units: issued Partners' Capital, common units: issued Partner's Capital, common units: outstanding Partners' Capital, common units: outstanding Condensed Consolidated Statements Of Comprehensive Income [Abstract] Revenues [Abstract] Revenues Segment Revenues Management and Advisory Fees Management and Advisory Fees, Net Total Management and Advisory Fees, Net Total Management and Advisory Fees Fees And Commission [Abstract] Performance Fees Realized Performance Fees Performance Fees Realized Realized Performance Fees, Realized Unrealized Performance Fees Performance Fees UnRealized Unrealized Performance Fees, Unrealized Total Performance Fees and Allocations Performance Fees, Ending Balance Performance Fees, Beginning Balance Total Performance Fees and Allocations Total Performance Fees Performance fees and allocations Investment Income (Loss) Investment Income Investment Income (Loss) Realized represents the gains and losses on the Partnership's principal investments, including its investments in Funds that are not consolidated, its equity method investments, and other principal investments. Investment Income (Loss) is realized when the Partnership redeems all or a portion of its investment or when the Partnership receives cash income, such as dividends or distributions, from its non-consolidated funds. Investment Income Loss Realized Realized Investment Income (Loss), Realized Investment Income (Loss) Unrealized represents the unrealized gains and losses on the Partnership's principal investments, including its investments in Funds that are not consolidated, its equity method investments, and other principal investments. Unrealized Investment Income (Loss) results from changes in the fair value of the underlying investment as well as the reversal of unrealized gain (loss) at the time an investment is realized. Investment Income Loss Unrealized Unrealized Unrealized Investment Income (Loss), Unrealized Gain Loss On Investments Net Realized (Gains) Losses on Investments Net Realized and Unrealized Gain from Investments Net Realized (Gains) Losses on Investments Total Investment Income Other investments, total Interest and Dividend Revenue Interest and dividend revenue Investment Income, Interest and Dividend, Total Interest and Dividend Revenue Attributable to Consolidated Blackstone Funds Other Other income Other Income, Total Other Income Total Revenues Revenues Total Revenues Expenses Salaries and Wages Compensation Base Compensation Performance Fee Compensation Performance Fee Compensation [Abstract] Performance Fee Compensation Performance Fee Compensation - Realized Compensation Performance Fee Compensation Realized Realized Performance Fee Compensation, Realized Realized Performance Fee Compensation - Unrealized Compensation Performance Fee Compensation Unrealized Performance Fee Compensation, Unrealized Unrealized Total Compensation and Benefits Total Compensation and Benefits General, Administrative and Other General and Administrative Expense, Total Interest Expense Interest Expense, Total Fund Expenses relating to the Partnership's consolidated noncontrolling interests in the Funds. Fund Expenses Consolidated Funds Fund Expenses Total expenses Expenses Total Expenses Other Income Other Income Net Gains (Losses) from Fund Investment Activities relating to the Partnership's consolidated noncontrolling interests in the Funds. Net Gains Losses From Fund Investment Activities Consolidated Funds Net Gains (Losses) from Fund Investment Activities Other Income - Net Gains (Losses) from Fund Investment Activities Other income - net gains from Fund investment activities Income (Loss) Before Provision (Benefit) for Taxes Income Before Provision for Taxes Income (Loss) Before Provision (Benefit) for Taxes Provision (Benefit) for Taxes Provision (Benefit) for Taxes Provision for Taxes Income Tax Expense (Benefit), Total Income tax provision expense (benefit) Net Loss Net Income (Loss) Net Loss Net Income Net Income Net Income Loss Attributable To Redeemable Non Controlling Interests In Consolidated Entities Funds Net Income Attributable to Redeemable Non-Controlling Interests in Consolidated Entities Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Non-Controlling Interests in Consolidated Entities Net Income Loss Attributable To Non Controlling Interests In Partnerships Net Income Loss Attributable To Non Controlling Interests In Partnerships Net Income Attributable to Non-Controlling Interests in Blackstone Holdings Net Income Attributable to Non-Controlling Interests in Blackstone Holdings Net income (loss) attributable to the Blackstone Group L.P. Net Income (Loss) Attributable to The Blackstone Group L.P. Net Income Attributable to The Blackstone Group L.P. Net Income Attributable to The Blackstone Group L.P. Net Income Loss Attributable to The Blackstone Group L.P. Net Income (Loss) Attributable to The Blackstone Group L.P. Net Loss Allocable to Common Unitholders Earnings Per Share, Basic Net Income Per Common Unit, Basic Earnings Per Share, Basic, Total Basic Net Income (Loss) Per Common Unit Common Units Diluted Net Income (Loss) Per Common Unit Net Income Per Common Unit, Diluted Earnings Per Share, Diluted, Total Net Income Per Common Unit, Diluted Weighted Average Number of Shares Outstanding, Basic Weighted-Average Common Units Outstanding Weighted-Average Common Units Outstanding - Basic Weighted Average Number of Shares Outstanding, Basic, Total Weighted-Average Common Units Outstanding Weighted Average Number of Shares Outstanding, Diluted Weighted-Average Diluted Common Units Outstanding Weighted-Average Common Units Outstanding - Diluted Weighted Average Number of Shares Outstanding, Diluted, Total Weighted-Average Common Units Outstanding, Diluted Revenues Earned from Affiliates [Abstract] Revenues Earned from Affiliates [Abstract] Revenues Earned from Affiliates Management and Advisory Fees From Affiliates Management and Advisory Fees From Affiliates Management and Advisory Fees Management and Advisory Fees earned from affiliates Net Income (Loss) Attributable to Parent Net Income (Loss) Net Income (Loss) Attributable to Parent, Total Net Income Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Currency Translation Adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Other Comprehensive Income (Loss), Net of Tax - Currency Translation Adjustment Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Comprehensive Income Comprehensive Income Comprehensive Income Attributable To Redeemable Non-Controlling Interests In Consolidated Entities Comprehensive Income Attributable To Redeemable Non-Controlling Interests In Consolidated Entities Less: Comprehensive Income Attributable to Redeemable Non-Controlling Interests in Consolidated Entities Comprehensive Income Attributable To Non-Controlling Interest In Consolidated Entities Comprehensive Income Attributable To Non-Controlling Interest In Consolidated Entities Less: Comprehensive Income (Loss) Attributable to Non-Controlling Interests in Consolidated Entities Comprehensive Income Attributable To Non Controlling Interests In Partnerships Comprehensive Income Attributable To Non Controlling Interests In Partnerships Less: Comprehensive Income Attributable to Non-Controlling Interests in Blackstone Holdings Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive Income Attributable to The Blackstone Group L.P. Comprehensive Income Attributable to The Blackstone Group L.P. Condensed Consolidated Statements Of Cash Flows [Abstract] Operating Activities Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by (Used in) Operating Activities: Adjustments to Reconcile Net Income to Net Cash Provided by (Used in) Operating Activities: Funds Related Abstract Funds Related Abstract Blackstone Funds Related: Unrealized Depreciation (Appreciation) on Investments Allocable to Non-Controlling Interests in Consolidated Entities Funds Related. Unrealized Depreciation Appreciation On Investments Allocable To Non Controlling Interests In Consolidated Entities Funds Related Unrealized Appreciation on Investments Allocable to Non-Controlling Interests in Consolidated Entities Unrealized (Appreciation) on Investments Allocable to Non-Controlling Interests in Consolidated Entities Net Realized (Gains) Losses on Investments Funds Related. Net Realized Gains Losses On Investments Funds Related Net Realized (Gains) Losses on Investments Net Realized Gains on Investments Net Realized Gains on Investments Changes in Unrealized (Gains) Losses on Investments Allocable to Parent and Funds Related. Changes In Unrealized Gains Losses On Investments Allocable To Parent And Funds Related Changes in Unrealized Gains on Investments Allocable to The Blackstone Group L.P. Changes in Unrealized (Gains) Losses on Investments Allocable to Blackstone Group Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Unrealized Depreciation on Hedge Activities Unrealized Depreciation (Appreciation) on Hedge Activities Net change in unrealized gains (losses) Non-Cash Performance Fees Non Cash Performance Fees Non-Cash Performance Fees Non-Cash Performance Fees Non-Cash Performance Fee Compensation Non Cash Performance Fee Compensation Non-Cash Performance Fee Compensation Non-Cash Performance Fee Compensation Equity-Based Compensation Expense Compensation expense in relation to equity-based awards Share-based Compensation, Total Amortization of Intangibles Amortization of Intangibles Amortization of Intangible Assets, Total Amortization of Intangibles Other Non-Cash Amounts Included in Net Income Other Non-Cash Amounts Included in Net Income Other Noncash Income (Expense), Total Cash Flows Due to Changes in Operating Assets and Liabilities: Increase(Decrease) in Cash Held by Funds and Other. Increase Decrease In Cash Held By Funds And Other Cash Held by Blackstone Funds and Other Cash Held by Blackstone Funds and Other Cash relinquished with continuing liquidation of partnership. Cash Relinquished With Continuing Liquidation Of Partnership Cash Relinquished with Deconsolidation and Liquidation of Partnership Cash Relinquished with Deconsolidation and Liquidation of Partnership Accounts Receivable Accounts Receivable Accounts Receivable Increase (Decrease) in Other Financial Instruments Used in Operating Activities Reverse Repurchase Agreements Reverse Repurchase Agreements Increase Decrease Due From Affiliates Due from Affiliates Due from Affiliates Other Assets Other Assets Increase (Decrease) in Other Operating Assets, Total Increase (Decrease) in Accrued Salaries Accrued Compensation and Benefits Accrued Compensation and Benefits Securities Sold, Not Yet Purchased. Securities Sold Not Yet Purchased Securities Sold, Not Yet Purchased Securities Sold, Not Yet Purchased Increase Decrease In Accounts Payable And Accrued Liabilities Accounts Payable, Accrued Expenses and Other Liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase Repurchase Agreements Due to Affiliates Due to Affiliates Due to Affiliates Treasury Cash Management Strategies [Abstract] Treasury Cash Management Strategies [Abstract] Treasury Cash Management Strategies: Short Term Investments Purchased Investments Purchased Investments Purchased Increase (Decrease) in Financial Instruments Used in Operating Activities, Total Proceeds from Sale and Maturity of Other Investments Proceeds from Sale of Investments Proceeds from Sale and Maturity of Other Investments, Total Cash Proceeds from Sale of Investments Fund Related Abstract Fund Related Abstract Blackstone Funds Related: Investments Purchased Investments Purchased Investments Purchased Payments to Acquire Investments, Total Cash Proceeds from Sale of Investments Cash Proceeds from Sale of Investments Cash Proceeds from Sale or Pay Down of Investments Cash Proceeds from Sale of Investments Cash Proceeds from Sale or Pay Down of Investments Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Net Cash Provided by Operating Activities Investing Activities Purchase of Furniture, Equipment and Leasehold Improvements Purchase of Furniture, Equipment and Leasehold Improvements Purchase of Furniture, Equipment and Leasehold Improvements Payments to Acquire Property, Plant, and Equipment, Total Net Cash Paid for Acquisition of Management Contracts Net Cash Paid for Acquisitions, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired, Total Net Cash Paid for Acquisitions, Net of Cash Acquired Changes in Restricted Cash Changes in Restricted Cash Increase (Decrease) in Restricted Cash, Total Net Cash Used in Investing Activities Net Cash Used in Investing Activities Financing Activities Distributions to Non-Controlling Interest Holders in Consolidated Entities Distributions to Non-Controlling Interest Holders in Consolidated Entities Contributions from Non-Controlling Interest Holders in Consolidated Entities Minority Interest Decrease From Redemptions Purchase of Interests from Certain Non-Controlling Interest Holders Net Settlement of Vested Common Units and Repurchase of Common and Partnership Units Net Settlement Of Vested Common Units And Repurchase Of Common And Partnership Units Net Settlement of Vested Common Units and Repurchase of Common and Holdings Units Net Settlement of Vested Common Units and Repurchase of Common and Partnership Units. Proceeds from loans Proceeds from Loans Payable Repayments of Long-term Debt Repayment of Loans Payable Repayment of Loans Payable Repayments of Long-term Debt, Total Limited Partners Capital Account Distribution Amount Distributions to Unitholders Funds Related Abstract Related Funds [Abstract] Blackstone Funds Related: Proceeds from Loans Payable Proceeds from Loans Payable Repayment of Loans Payable Repayment of Loans Payable Repayment of Loans Payable Net Cash Provided by (Used in) Financing Activities Net Cash Used in Financing Activities Effect of Exchange Rate Changes on Cash and Cash Equivalents Effect of Exchange Rate Changes on Cash and Cash Equivalents Net Increase (Decrease) in Cash and Cash Equivalents Net Decrease in Cash and Cash Equivalents Supplemental Disclosure of Cash Flows Information Interest Paid Payments for Interest Interest Paid, Total Income Taxes Paid Payments for Income Taxes Supplemental Disclosure of Non-Cash Operating Activities Supplemental Disclosure of Non-Cash Investing and Financing Activities Adjustments of Non-cash items to reconcile Net income (loss) to cash provided by (used in) operating activities for the Blackstone Funds Net Activities Related To Capital Transactions Of Consolidated Funds Net Activities Related to Capital Transactions of Consolidated Blackstone Funds Net Assets Related to the Consolidation of CLO Vehicles Net Assets Related to the Consolidation of Clo Vehicles Net Assets Related to the Consolidation of CLO Vehicles In-kind Redemption of Capital In-kind Contribution of Capital Capital Contributions In-kind Contribution of Capital In-kind Contribution of Capital Notes Issuance Costs Transfer of Interests to Non-controlling Interest Holders Transfer Of Interests To Non Controlling Interest Holders Transfer of Interests to Non-Controlling Interest Holders Change of Parent Ownership Interest Change Of Parent Ownership Interest Change in The Blackstone Group L.P.'s Ownership Interest Net settlement of Vested Common units Net Settlement Of Vested Common Units Net Settlement of Vested Common Units Conversion of Blackstone Holdings Units to Common Units Conversion of Blackstone Holdings Units to Common Units Exchange of Founders and Senior Managing Directors' Interests in Partnership: [Abstract]. Exchange of Founders and Senior Managing Directors Interests in Partnership [Abstract] Exchange of Founders' and Non-Controlling Interest Holders' Interests in Blackstone Holdings: Deferred Tax Asset Exchange of Founders and Senior Managing Directors Interests in Partnership Holdings Deferred Tax Asset Exchange of Founders and Senior Managing Directors Interests in Partnership Holdings Deferred Tax Asset Due to Affiliates from Non Cash Financing Activities Exchange of Founders and Senior Managing Directors Interests in Partnership Holdings Due to Affiliates from Non Cash Financing Activities Exchange of Founders and Senior Managing Directors Interests in Partnership Holdings Due to Affiliates Partners Capital Account Period increase Decrease Exchange of Founders and Senior Managing Directors Interests in Partnership Holdings Partners Capital Account Period increase Decrease Exchange of Founders and Senior Managing Directors Interests in Partnership Holdings Partners' Capital ORGANIZATION [Abstract] Organization [Abstract] Nature of Operations [Text Block] ORGANIZATION Organization Summary Of Significant Accounting Policies [Abstract] Significant Accounting Policies Text Block SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Summary Of Significant Accounting Policies Acquisitions, Goodwill And Intangible Assets [Abstract] Goodwill And Intangible Assets Disclosure Text Block ACQUISITIONS, GOODWILL AND INTANGIBLE ASSETS Acquisitions, Goodwill And Intangible Assets Investments [Abstract] Investment [Line Items] Investments [Line Items] 'Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosure Text Block INVESTMENTS Investments Net Asset Value As Fair Value [Abstract] Net asset value as fair value by strategy [Line Items]. Net Asset Value As Fair Value By Strategy [Line Items] Net Asset Value As Fair Value [Text Block] Net Asset Value As Fair Value [Text Block] Net Asset Value As Fair Value Derivative Financial Instruments [Abstract] Derivative [Line Items] Derivative Instruments and Hedging Activities Disclosure [Text Block] DERIVATIVE FINANCIAL INSTRUMENTS Derivative Financial Instruments FAIR VALUE OPTION [Abstract] Fair Value Option [Abstract] Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value Option Text Block FAIR VALUE OPTION Fair Value Option FAIR VALUE MEASUREMENTS OF FINANCIAL INSTRUMENTS [Abstract] Fair Value Measurements Of Financial Instruments [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Disclosures Text Block FAIR VALUE MEASUREMENTS OF FINANCIAL INSTRUMENTS Fair Value Measurements Of Financial Instruments VARIABLE INTEREST ENTITIES [Abstract] Variable Interest Entities [Abstract] Variable Interest Entity [Line Items] Schedule Of Variable Interest Entities Text Block VARIABLE INTEREST ENTITIES Variable Interest Entities Reverse Repurchase And Repurchase Agreements [Abstract] Schedule Of Resale Agreements [Text Block] Schedule Of Resale Agreements [Text Block] Reverse Repurchase And Repurchase Agreements Reverse Repurchase and Repurchase Agreements Borrowings [Abstract] Debt Instrument [Line Items] Debt Disclosure Text Block BORROWINGS Borrowings Income Taxes [Abstract] Income Tax Disclosure Text Block INCOME TAXES Income Taxes Net Income (Loss) Per Common Unit [Abstract] Earnings Per Share [Text Block] NET LOSS PER COMMON UNIT Net Income (Loss) Per Common Unit