Summary of Fair Value by Strategy Type Alongside Consolidated Funds of Hedge Funds' Remaining Unfunded Commitments and Ability to Redeem Such Investments (Detail) (USD $)
In Thousands, unless otherwise specified

Sep. 30, 2014

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]

$ 1,212,165

Unfunded Commitments

1,415

Diversified Instruments

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]

185,841

^[1]

Unfunded Commitments

1,415

^[1]

Credit Driven

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]

336,773

^[2]

Event Driven

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]

187,665

^[3]

Equity

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]

360,613

^[4]

Commodities

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]

55,909

^[5]

Private Equity

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]

$ 85,364

^[6]

[1]	Diversified Instruments include investments in funds that invest across multiple strategies. Investments representing 79% of the fair value of the investments in this category may not be redeemed at, or within three months of, the reporting date. Investments representing 16% of the fair value of the investments in this category represent investments in hedge funds that are in the process of liquidating. Distributions from these funds will be received as underlying investments are liquidated. The time at which this redemption restriction may lapse cannot be estimated. The remaining 5% of investments in this category are redeemable as of the reporting date. As of the reporting date, the investee fund manager had elected to side pocket 10% of Blackstone's investments in this category.
[2]	The Credit Driven category includes investments in hedge funds that invest primarily in domestic and international bonds. Investments representing 68% of the fair value of the investments in this category may not be redeemed at, or within three months of, the reporting date. Investments representing 30% of the fair value of the investments in this category are redeemable as of the reporting date. Investments representing 2% of the total fair value in the credit driven category are subject to redemption restrictions at the discretion of the investee fund manager who may choose (but may not have exercised such ability) to side pocket such investments. As of the reporting date, the investee fund manager had not elected to side pocket any of Blackstone's investments in this category.
[3]	The Event Driven category includes investments in hedge funds whose primary investing strategy is to identify certain event-driven investments. Withdrawals are not permitted in this category. Distributions will be received as the underlying investments are liquidated.
[4]	The Equity category includes investments in hedge funds that invest primarily in domestic and international equity securities. Withdrawals are generally not permitted for investments in this category. Distributions will be received as the underlying investments are liquidated.
[5]	The Commodities category includes investments in commodities-focused funds that primarily invest in futures and physical-based commodity driven strategies. Withdrawals are not permitted for investments representing 95% of the fair value of investments in this category. Distributions will be received as the underlying investments are liquidated. The remaining 5% of the fair value of the investments in this category may not be redeemed at, or within three months of, the reporting date.
[6]	The Private Equity category includes investments in private equity funds that primarily invest in private equity, revenue interests and other private investments. Withdrawals are not permitted for investments in this category.