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Summary of Aggregate Notional Amount and Fair Value of Derivative Financial Instruments (Detail) - Freestanding Derivatives - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	$ 1,223,724	$ 1,152,201
Derivative Liabilities, Notional	813,393	1,229,128
Derivative Assets, Fair Value	40,581	45,497
Derivative Liabilities, Fair Value	54,521	52,844
Blackstone | Credit Default Swap
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	2,204
Derivative Liabilities, Notional	29,205	34,060
Derivative Assets, Fair Value	81
Derivative Liabilities, Fair Value	1,200	4,004
Consolidated Blackstone Funds | Credit Default Swap
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	12,612	20,952
Derivative Liabilities, Notional	59,888	46,685
Derivative Assets, Fair Value	535	55
Derivative Liabilities, Fair Value	2,435	5,710
Consolidated Blackstone Funds | Total Return Swaps
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	10,851
Derivative Liabilities, Notional	22,567	31,440
Derivative Assets, Fair Value	15
Derivative Liabilities, Fair Value	382	1,855
Foreign Currency Contracts | Blackstone
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	167,699	224,841
Derivative Liabilities, Notional	106,500	245,371
Derivative Assets, Fair Value	615	1,286
Derivative Liabilities, Fair Value	444	1,636
Foreign Currency Contracts | Consolidated Blackstone Funds
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	29,931	108,271
Derivative Liabilities, Notional	78,769	16,952
Derivative Assets, Fair Value	863	524
Derivative Liabilities, Fair Value	814	164
Interest Rate Contracts | Blackstone
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	1,000,426	798,137
Derivative Liabilities, Notional	488,463	844,620
Derivative Assets, Fair Value	38,299	43,632
Derivative Liabilities, Fair Value	47,845	39,164
Interest Rate Contracts | Consolidated Blackstone Funds
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Notional	28,000	10,000
Derivative Liabilities, Fair Value	1,382	$ 311
Equity Option | Consolidated Blackstone Funds
Derivatives, Fair Value [Line Items]
Derivative Assets, Notional	1
Derivative Liabilities, Notional	1
Derivative Assets, Fair Value	173
Derivative Liabilities, Fair Value	$ 19

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

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