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Summary of Aggregate Notional Amount and Fair Value of Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Fair Value | $ 98,632 | $ 98,738
Derivative Liabilities, Fair Value | 38,036 | 19,948
Derivative Assets, Notional | 1,396,670 | 966,983
Derivative Liabilities, Notional | 1,317,759 | 860,302
Fair Value Hedging | Interest Rate Swap |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Fair Value |  | 67,668
Derivative Assets, Notional |  | 450,000
Freestanding Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Fair Value | 98,632 | 31,070
Derivative Liabilities, Fair Value | 38,036 | 19,948
Derivative Assets, Notional | 1,396,670 | 516,983
Derivative Liabilities, Notional | 1,317,759 | 860,302
Freestanding Derivatives | Interest Rate Contracts | Blackstone - Other |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Fair Value | 52,009 | 768
Derivative Liabilities, Fair Value | 2,565 | 1,291
Derivative Assets, Notional | 905,450 | 221,350
Derivative Liabilities, Notional | 770,950 | 502,200
Freestanding Derivatives | Interest Rate Contracts | Investments Of Consolidated Blackstone Funds |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Fair Value | 8,203 | 7,270
Derivative Liabilities, Fair Value | 4,103 | 10,867
Derivative Assets, Notional | 176,495 | 95,482
Derivative Liabilities, Notional | 176,400 | 191,400
Freestanding Derivatives | Foreign Currency Contracts | Blackstone - Other |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Fair Value | 173 | 1,016
Derivative Liabilities, Fair Value | 125 | 103
Derivative Assets, Notional | 4,167 | 22,698
Derivative Liabilities, Notional | 7,275 | 7,293
Freestanding Derivatives | Foreign Currency Contracts | Investments Of Consolidated Blackstone Funds |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Fair Value | 38,247 | 22,016
Derivative Liabilities, Fair Value | 31,133 | 7,687
Derivative Assets, Notional | 310,558 | 177,453
Derivative Liabilities, Notional | 362,534 | 159,409
Freestanding Derivatives | Credit Default Swap | Blackstone - Other |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities, Fair Value | 110 |
Derivative Liabilities, Notional | $ 600 |

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