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Summary of Fair Value by Strategy Type Alongside Consolidated Funds of Hedge Funds' Remaining Unfunded Commitments and Ability to Redeem Such Investments (Parenthetical) (Detail)
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Jun. 30, 2012
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Diversified Instruments
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| Net Asset Value As Fair Value By Strategy [Line Items] | |
| Percentage of investments unable to be redeemed at, or within 3 months of reporting date | 43.00% |
| Percentage of investments in hedge funds | 57.00% |
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Credit Driven
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| Net Asset Value As Fair Value By Strategy [Line Items] | |
| Percentage of investments unable to be redeemed at, or within 3 months of reporting date | 65.00% |
| Rate of investee fund manager Blackstone investments | 18.00% |
| Percentage of investments redeemable as of reporting date | 17.00% |
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Equity
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| Net Asset Value As Fair Value By Strategy [Line Items] | |
| Percentage of investments unable to be redeemed at, or within 3 months of reporting date | 85.00% |
| Rate of investee fund manager Blackstone investments | 15.00% |