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Summary of Changes in Financial Assets Measured at Fair Value for Which Level III Inputs Were Used (Detail) - Level 3 - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance, Beginning of Period	$ 1,511,159	$ 1,243,635	$ 1,724,374	$ 1,388,672
Transfer In Due to Consolidation and Acquisition				50,043
Transfer Out Due to Deconsolidation				(217,182)
Transfer In to Level III	153,261	152,666	119,579	180,401
Transfer Out of Level III	(309,169)	(124,866)	(427,572)	(156,821)
Purchases	316,490	512,808	462,897	799,556
Sales	(307,943)	(261,530)	(535,054)	(548,047)
Settlements	(3,038)	(5,635)	(10,189)	(9,321)
Changes in Gains (Losses) Included in Earnings	16,219	30,972	42,944	60,749
Balance, End of Period	1,376,979	1,548,050	1,376,979	1,548,050
Changes in Unrealized Gains (Losses) Included in Earnings Related to Investments Still Held at the Reporting Date	(3,925)	5,450	23,479	28,020
Other Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance, Beginning of Period	59,133	117,349	56,185	119,642
Transfer In to Level III	3,986		12,935
Transfer Out of Level III	(14,557)	(7,649)	(27,170)	(15,717)
Purchases	5,251	15,327	12,820	19,812
Sales	(5,270)	(23,304)	(6,141)	(23,479)
Settlements		(1)		(4)
Changes in Gains (Losses) Included in Earnings	509	13,001	423	14,469
Balance, End of Period	49,052	114,723	49,052	114,723
Changes in Unrealized Gains (Losses) Included in Earnings Related to Investments Still Held at the Reporting Date	135	(49)	315	(289)
Loans and Receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance, Beginning of Period	208,226	163,135	304,173	239,659
Purchases	198,482	294,258	270,772	370,921
Sales	(218,148)	(110,508)	(383,816)	(263,703)
Settlements	(3,038)	(5,634)	(10,189)	(9,317)
Changes in Gains (Losses) Included in Earnings	2,309	5,352	6,891	9,043
Balance, End of Period	187,831	346,603	187,831	346,603
Changes in Unrealized Gains (Losses) Included in Earnings Related to Investments Still Held at the Reporting Date	(1,898)	5,353	(2,657)	9,044
Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance, Beginning of Period	1,243,800	963,151	1,364,016	1,029,371
Transfer In Due to Consolidation and Acquisition				50,043
Transfer Out Due to Deconsolidation				(217,182)
Transfer In to Level III	149,275	152,666	106,644	180,401
Transfer Out of Level III	(294,612)	(117,217)	(400,402)	(141,104)
Purchases	112,757	203,223	179,305	408,823
Sales	(84,525)	(127,718)	(145,097)	(260,865)
Changes in Gains (Losses) Included in Earnings	13,401	12,619	35,630	37,237
Balance, End of Period	1,140,096	1,086,724	1,140,096	1,086,724
Changes in Unrealized Gains (Losses) Included in Earnings Related to Investments Still Held at the Reporting Date	$ (2,162)	$ 146	$ 25,821	$ 19,265

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