Financial Data of Segments (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Realized Incentive Fees		$ 19,378	$ 40,303	$ 31,944	$ 86,814
Performance Revenues Realized - Allocations		503,376	602,662	773,016	1,714,567
Performance Revenues Unrealized - Allocations		440,351	95,532	1,068,440	(29,089)
Principal Investment Income (Loss), Realized		129,197	125,058	171,342	376,402
Principal Investment Income (Loss), Unrealized		103,468	7,275	215,242	(32,913)
Total Investment Income		1,176,392	830,527	2,228,040	2,028,967
Interest and Dividend Revenue		40,073	33,703	75,458	62,198
Other		675,343	(59,664)	616,026	(63,876)
Total Revenues		2,632,570	1,535,726	4,401,701	3,450,444
Compensation		427,479	367,203	816,882	718,792
Performance Compensation, Realized - Allocations		186,398	195,738	298,460	562,216
Performance Compensation, Unrealized - Allocations		189,991	86,910	444,426	94,443
Total Compensation and Benefits		813,611	670,883	1,576,173	1,418,948
Interest Expense		39,320	41,089	77,991	81,335
Total Expenses		1,016,381	881,193	1,999,312	1,802,966
Economic Income	[1]	1,689,708	764,587	2,586,507	1,823,664
Segment Assets		30,075,297		30,075,297		$ 34,415,919
Investment Advice
Segment Reporting Information [Line Items]
Management and Advisory Fees, Net		721,384	690,857	1,450,233	1,336,341
Operating Segments
Segment Reporting Information [Line Items]
Realized Incentive Fees			40,303		86,814
Transaction, Advisory and Other Fees, Net		40,912	38,892	77,978	79,114
Management Fee Offsets		(10,833)	(13,424)	(19,011)	(47,023)
Performance Revenues Realized - Incentive Fees		19,504		32,070
Performance Revenues Realized - Allocations		503,555	603,096	773,197	1,715,044
Performance Revenues Unrealized - Allocations		440,424	95,707	1,068,763	(28,371)
Total Performance Revenue		963,483	739,106	1,874,030	1,773,487
Principal Investment Income (Loss), Realized		94,647	100,887	123,340	303,781
Principal Investment Income (Loss), Unrealized		52,126	(33,167)	66,104	(132,102)
Total Investment Income		146,773	67,720	189,444	171,679
Interest and Dividend Revenue		41,727	33,703	78,112	62,199
Other		94,416	(62,469)	33,522	(70,756)
Total Revenues		1,969,393	1,474,896	3,634,146	3,283,026
Compensation		317,390		653,717	594,284
Expenses			305,257
Performance Compensation, Realized - Incentive Fees		9,743	21,032	16,405	43,497
Performance Compensation, Realized - Allocations		186,398	195,738	298,460	562,216
Performance Compensation, Unrealized - Allocations		189,991	86,910	444,426	94,443
Total Compensation and Benefits		703,522	608,937	1,413,008	1,294,440
Interest Expense		38,885	40,294	77,123	79,744
Other Operating Expenses		122,466	105,838	229,558	202,300
Total Expenses		864,873	755,069	1,719,689	1,576,484
Economic Income	[1]	1,104,520	719,827	1,914,457	1,706,542
Segment Assets		21,486,487		21,486,487
Operating Segments | Management Service, Base
Segment Reporting Information [Line Items]
Management and Advisory Fees, Net		692,915	671,368	1,400,071	1,314,326
Operating Segments | Investment Advice
Segment Reporting Information [Line Items]
Management and Advisory Fees, Net		722,994	696,836	1,459,038	1,346,417
Operating Segments | Private Equity Segment
Segment Reporting Information [Line Items]
Transaction, Advisory and Other Fees, Net		12,780	17,289	23,874	33,465
Management Fee Offsets		(4,351)	(3,753)	(7,544)	(15,943)
Performance Revenues Realized - Allocations		138,171	198,168	215,294	780,849
Performance Revenues Unrealized - Allocations		498,274	9	895,590	(184,469)
Total Performance Revenue		636,445	198,177	1,110,884	596,380
Principal Investment Income (Loss), Realized		32,600	41,168	38,938	122,462
Principal Investment Income (Loss), Unrealized		84,247	(25,892)	101,615	(66,414)
Total Investment Income		116,847	15,276	140,553	56,048
Interest and Dividend Revenue		11,549	7,922	20,092	14,583
Other		26,667	(16,124)	10,259	(17,924)
Total Revenues		995,458	396,471	1,676,600	1,020,999
Compensation		103,798		203,527	174,279
Expenses			90,676
Performance Compensation, Realized - Allocations		68,513	63,060	101,558	244,693
Performance Compensation, Unrealized - Allocations		193,747	22,219	372,549	(17,137)
Total Compensation and Benefits		366,058	175,955	677,634	401,835
Interest Expense		12,773	10,728	22,906	21,155
Other Operating Expenses		36,047	28,592	67,198	56,353
Total Expenses		414,878	215,275	767,738	479,343
Economic Income		580,580	181,196	908,862	541,656
Segment Assets		7,574,520		7,574,520
Operating Segments | Private Equity Segment | Management Service, Base
Segment Reporting Information [Line Items]
Management and Advisory Fees, Net		195,521	177,684	378,482	354,390
Operating Segments | Private Equity Segment | Investment Advice
Segment Reporting Information [Line Items]
Management and Advisory Fees, Net		203,950	191,220	394,812	371,912
Operating Segments | Real Estate Segment
Segment Reporting Information [Line Items]
Realized Incentive Fees			4,878		7,760
Transaction, Advisory and Other Fees, Net		23,859	16,087	46,947	37,366
Management Fee Offsets		(3,785)	(5,018)	(5,453)	(8,568)
Performance Revenues Realized - Incentive Fees		11,394		15,769
Performance Revenues Realized - Allocations		351,630	389,441	502,939	909,314
Performance Revenues Unrealized - Allocations		(160,578)	89,688	65,864	81,642
Total Performance Revenue		202,446	484,007	584,572	998,716
Principal Investment Income (Loss), Realized		50,199	57,599	64,889	177,178
Principal Investment Income (Loss), Unrealized		(28,044)	(20,519)	(25,357)	(104,372)
Total Investment Income		22,155	37,080	39,532	72,806
Interest and Dividend Revenue		14,494	14,493	29,622	26,587
Other		30,457	(22,965)	8,960	(26,115)
Total Revenues		539,306	751,549	1,180,386	1,526,536
Compensation		109,599		222,423	212,968
Expenses			110,266
Performance Compensation, Realized - Incentive Fees		5,820	2,711	8,030	4,044
Performance Compensation, Realized - Allocations		109,233	124,512	163,416	304,468
Performance Compensation, Unrealized - Allocations		(51,370)	64,254	27,800	82,046
Total Compensation and Benefits		173,282	301,743	421,669	603,526
Interest Expense		11,389	14,787	25,538	29,422
Other Operating Expenses		36,026	33,379	65,443	64,243
Total Expenses		220,697	349,909	512,650	697,191
Economic Income		318,609	401,640	667,736	829,345
Segment Assets		7,536,885		7,536,885
Operating Segments | Real Estate Segment | Management Service, Base
Segment Reporting Information [Line Items]
Management and Advisory Fees, Net		249,680	227,865	476,206	425,744
Operating Segments | Real Estate Segment | Investment Advice
Segment Reporting Information [Line Items]
Management and Advisory Fees, Net		269,754	238,934	517,700	454,542
Operating Segments | Hedge Fund Solutions Segment
Segment Reporting Information [Line Items]
Realized Incentive Fees			6,548		20,635
Transaction, Advisory and Other Fees, Net		812	1,696	1,157	1,955
Performance Revenues Realized - Incentive Fees		6,887		15,058
Performance Revenues Realized - Allocations		383	447	2,389	1,044
Performance Revenues Unrealized - Allocations		9,930	14,849	14,991	33,664
Total Performance Revenue		17,200	21,844	32,438	55,343
Principal Investment Income (Loss), Realized		7,766	225	8,406	(407)
Principal Investment Income (Loss), Unrealized		(4,841)	11,578	(4,401)	29,871
Total Investment Income		2,925	11,803	4,005	29,464
Interest and Dividend Revenue		5,152	4,674	9,964	8,671
Other		17,619	(10,720)	7,331	(12,330)
Total Revenues		173,261	157,995	313,676	340,269
Compensation		48,086		98,386	94,965
Expenses			47,361
Performance Compensation, Realized - Incentive Fees		4,155	4,097	8,189	11,111
Performance Compensation, Realized - Allocations		937	265	3,352	568
Performance Compensation, Unrealized - Allocations		2,772	5,968	4,958	12,390
Total Compensation and Benefits		55,950	57,691	114,885	119,034
Interest Expense		5,900	6,688	12,171	13,231
Other Operating Expenses		18,494	16,318	37,279	32,697
Total Expenses		80,344	80,697	164,335	164,962
Economic Income		92,917	77,298	149,341	175,307
Segment Assets		2,275,685		2,275,685
Operating Segments | Hedge Fund Solutions Segment | Management Service, Base
Segment Reporting Information [Line Items]
Management and Advisory Fees, Net		129,553	128,698	258,781	257,166
Operating Segments | Hedge Fund Solutions Segment | Investment Advice
Segment Reporting Information [Line Items]
Management and Advisory Fees, Net		130,365	130,394	259,938	259,121
Operating Segments | Credit Segment
Segment Reporting Information [Line Items]
Realized Incentive Fees			28,877		58,419
Transaction, Advisory and Other Fees, Net		3,461	3,820	6,000	6,328
Management Fee Offsets		(2,697)	(4,653)	(6,014)	(22,512)
Performance Revenues Realized - Incentive Fees		1,223		1,243
Performance Revenues Realized - Allocations		13,371	15,040	52,575	23,837
Performance Revenues Unrealized - Allocations		92,798	(8,839)	92,318	40,792
Total Performance Revenue		107,392	35,078	146,136	123,048
Principal Investment Income (Loss), Realized		4,082	1,895	11,107	4,548
Principal Investment Income (Loss), Unrealized		764	1,666	(5,753)	8,813
Total Investment Income		4,846	3,561	5,354	13,361
Interest and Dividend Revenue		10,532	6,614	18,434	12,358
Other		19,673	(12,660)	6,972	(14,387)
Total Revenues		261,368	168,881	463,484	395,222
Compensation		55,907		129,381	112,072
Expenses			56,954
Performance Compensation, Realized - Incentive Fees		(232)	14,224	186	28,342
Performance Compensation, Realized - Allocations		7,715	7,901	30,134	12,487
Performance Compensation, Unrealized - Allocations		44,842	(5,531)	39,119	17,144
Total Compensation and Benefits		108,232	73,548	198,820	170,045
Interest Expense		8,823	8,091	16,508	15,936
Other Operating Expenses		31,899	27,549	59,638	49,007
Total Expenses		148,954	109,188	274,966	234,988
Economic Income		112,414	59,693	188,518	160,234
Segment Assets		4,099,397		4,099,397
Operating Segments | Credit Segment | Management Service, Base
Segment Reporting Information [Line Items]
Management and Advisory Fees, Net		118,161	137,121	286,602	277,026
Operating Segments | Credit Segment | Investment Advice
Segment Reporting Information [Line Items]
Management and Advisory Fees, Net		$ 118,925	$ 136,288	$ 286,588	$ 260,842

[1] Represents Total Segments Economic Income reconciled to Blackstone Consolidated Income Before Provision for Taxes.