Summary of Aggregate Notional Amount and Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	$ 1,674,018	$ 1,943,891
Derivative Liabilities, Notional	2,069,529	2,055,466
Derivative Assets, Fair Value	190,464	190,079
Derivative Liabilities, Fair Value	743,977	654,621
Freestanding Derivatives
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	839,931	855,683
Derivative Assets, Fair Value	26,800	19,189
Freestanding Derivatives \| Blackstone
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	834,087	1,088,208
Derivative Liabilities, Notional	2,069,529	2,055,466
Derivative Assets, Fair Value	163,664	170,890
Derivative Liabilities, Fair Value	743,977	654,621
Freestanding Derivatives \| Blackstone \| Total Return Swaps
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	39,956	63,158
Derivative Assets, Fair Value	5,812	13,171
Freestanding Derivatives \| Blackstone \| Credit Default Swap
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional		3,108
Derivative Liabilities, Notional	640	3,748
Derivative Assets, Fair Value		479
Derivative Liabilities, Fair Value	8	508
Freestanding Derivatives \| Foreign Currency Contracts \| Blackstone
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	167,391	387,102
Derivative Liabilities, Notional	337,017	334,228
Derivative Assets, Fair Value	465	11,442
Derivative Liabilities, Fair Value	901	3,538
Freestanding Derivatives \| Interest Rate Contracts \| Blackstone
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	626,740	634,840
Derivative Liabilities, Notional	600,000	607,000
Derivative Assets, Fair Value	157,387	145,798
Derivative Liabilities, Fair Value	97,066	86,589
Freestanding Derivatives \| Interest Rate Contracts \| Consolidated Blackstone Funds
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	839,931	855,683
Derivative Assets, Fair Value	26,800	19,189
Freestanding Derivatives \| Equity Options \| Blackstone
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Notional	1,131,872	1,110,490
Derivative Liabilities, Fair Value	$ 646,002	$ 563,986

Nominal or face amount used to calculate payments on the derivative asset.

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