v2.4.0.8
Financial Assets and Liabilities at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment Funds $ 1,091,151 [1] $ 897,843 [1]
Equity Securities 366,529 [1] 375,662 [1]
Partnership and LLC Interests 1,488,428 [1] 1,343,458 [1]
Debt Instruments 1,655,760 [1] 1,200,397 [1]
Freestanding Derivatives, Assets 21,147 44,899
Investments of Consolidated Funds 10,733,353 [1] 12,521,248 [1]
Blackstone's Treasury Cash Management Strategies 1,693,373 1,104,800
Money Market Funds 256,415 173,781
Other Investments 138,377 118,804
Total Financial Assets 12,897,766 14,066,764
Freestanding Derivatives, Liabilities 32,458 14,300
Total Liabilities of Consolidated Blackstone Funds 5,710,719  
Securities Sold, Not Yet Purchased 188,363 76,195
Total Financial Liabilities 5,903,741 9,003,502
Corporate Loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate Loans 5,870,633 [1] 8,466,889 [1]
Loans And Receivables
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans and Receivables 69,794 137,788
Credit Default Swaps
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Liabilities 1,835 591
Liabilities Of Consolidated Blackstone Funds | Credit Default Swaps | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Liabilities 5,179 [1]  
Corporate Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate Bonds 196,703 [1] 161,382 [1]
Foreign Currency Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Liabilities 831 1,015
Foreign Currency Contracts | Investments Of Consolidated Blackstone Funds | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Assets 11,921 [1] 30,830 [1]
Foreign Currency Contracts | Blackstone - Other | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Assets 5,200 1,480
Interest Rate Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Liabilities 1,993 2,676
Interest Rate Contracts | Investments Of Consolidated Blackstone Funds | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Assets 2,772 [1] 3,726 [1]
Interest Rate Contracts | Blackstone - Other | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Assets 1,254 8,521
Total Return Swaps | Blackstone - Other | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Assets   342
Other
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other 49,456 [1] 41,061 [1]
Liabilities of Consolidated CLO Vehicles | Foreign Currency Contracts | Liabilities Of Consolidated Blackstone Funds | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Liabilities 22,620 [1] 10,018 [1]
Liabilities of Consolidated CLO Vehicles | Senior Secured Notes
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of Notes 5,322,648 [1] 8,302,572 [1]
Liabilities of Consolidated CLO Vehicles | Subordinated Notes
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of Notes 360,272 [1] 610,435 [1]
Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities 94,774 [1] 51,147 [1]
Debt Instruments 1,614 [1]  
Investments of Consolidated Funds 96,402 [1] 54,624 [1]
Blackstone's Treasury Cash Management Strategies 338,131 19,629
Money Market Funds 256,415 173,781
Other Investments 17,044 87,068
Total Financial Assets 708,386 342,525
Total Financial Liabilities 1,184 2,484
Level 1 | Interest Rate Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Liabilities 1,184 2,484
Level 1 | Interest Rate Contracts | Blackstone - Other | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Assets 394 7,423
Level 1 | Other
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other 14 [1] 3,477 [1]
Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities 91,948 [1] 130,816 [1]
Partnership and LLC Interests 222,488 [1] 88,555 [1]
Debt Instruments 1,531,371 [1] 1,154,902 [1]
Investments of Consolidated Funds 7,413,318 [1] 9,107,872 [1]
Blackstone's Treasury Cash Management Strategies 1,274,175 1,041,039
Other Investments 7,199 17,270
Total Financial Assets 8,700,752 10,169,101
Total Liabilities of Consolidated Blackstone Funds 27,799  
Securities Sold, Not Yet Purchased 188,363 76,195
Total Financial Liabilities 219,637 88,011
Level 2 | Corporate Loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate Loans 5,332,759 [1] 7,537,661 [1]
Level 2 | Credit Default Swaps
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Liabilities 1,835 591
Level 2 | Liabilities Of Consolidated Blackstone Funds | Credit Default Swaps | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Liabilities 5,179 [1]  
Level 2 | Corporate Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate Bonds 196,703 [1] 161,382 [1]
Level 2 | Foreign Currency Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Liabilities 831 1,015
Level 2 | Foreign Currency Contracts | Investments Of Consolidated Blackstone Funds | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Assets 11,921 [1] 30,830 [1]
Level 2 | Foreign Currency Contracts | Blackstone - Other | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Assets 5,200 1,480
Level 2 | Interest Rate Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Liabilities 809 192
Level 2 | Interest Rate Contracts | Investments Of Consolidated Blackstone Funds | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Assets 2,772 [1] 3,726 [1]
Level 2 | Interest Rate Contracts | Blackstone - Other | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Assets 860 1,098
Level 2 | Total Return Swaps | Blackstone - Other | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Assets   342
Level 2 | Other
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other 23,356 [1]  
Level 2 | Liabilities of Consolidated CLO Vehicles | Foreign Currency Contracts | Liabilities Of Consolidated Blackstone Funds | Freestanding Derivatives
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Freestanding Derivatives, Liabilities 22,620 [1] 10,018 [1]
Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment Funds 1,091,151 [1] 897,843 [1]
Equity Securities 179,807 [1] 193,699 [1]
Partnership and LLC Interests 1,265,940 [1] 1,254,903 [1]
Debt Instruments 122,775 [1] 45,495 [1]
Investments of Consolidated Funds 3,223,633 [1] 3,358,752 [1]
Blackstone's Treasury Cash Management Strategies 81,067 44,132
Other Investments 114,134 14,466
Total Financial Assets 3,488,628 3,555,138
Total Liabilities of Consolidated Blackstone Funds 5,682,920  
Total Financial Liabilities 5,682,920 8,913,007
Level 3 | Corporate Loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate Loans 537,874 [1] 929,228 [1]
Level 3 | Loans And Receivables
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans and Receivables 69,794 137,788
Level 3 | Other
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other 26,086 [1] 37,584 [1]
Level 3 | Liabilities of Consolidated CLO Vehicles | Senior Secured Notes
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of Notes 5,322,648 [1] 8,302,572 [1]
Level 3 | Liabilities of Consolidated CLO Vehicles | Subordinated Notes
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of Notes $ 360,272 [1] $ 610,435 [1]
[1] Pursuant to GAAP consolidation guidance, the Partnership is required to consolidate all VIEs in which it has been identified as the primary beneficiary, including certain CLO vehicles, and other funds in which a consolidated entity of the Partnership, as the general partner of the fund, is presumed to have control. While the Partnership is required to consolidate certain funds, including CLO vehicles, for GAAP purposes, the Partnership has no ability to utilize the assets of these funds and there is no recourse to the Partnership for their liabilities since these are client assets and liabilities.