Financial Data of Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total Management and Advisory Fees, Net									$ 2,193,985	$ 2,030,693	$ 1,811,750
Performance Fees Realized - Carried Interest									943,958	327,422	138,907
Performance Fees Realized - Incentive Fees									464,838	301,801	90,099
Performance Fees Unrealized - Carried Interest									2,158,010	994,190	971,518
Performance Fees Unrealized - Incentive Fees									(22,749)	(30,361)	(17,864)
Total Performance Fees									3,544,057	1,593,052	1,182,660
Investment Income (Loss), Realized									188,644	93,963	87,542
Investment Income (Loss), Unrealized									611,664	256,231	125,781
Total Investment Income (Loss)									800,308	350,194	213,323
Interest and Dividend Revenue									64,511	40,354	37,427
Other									10,307	5,148	7,416
Total Revenues	2,709,380	1,216,845	1,440,470	1,246,473	1,217,113	1,223,089	627,203	952,036	6,613,168	4,019,441	3,252,576
Compensation									1,844,485	2,091,698	2,421,712
Performance Fee Compensation - Realized Carried Interest									257,201	96,433	43,615
Performance Fee Compensation - Realized Incentive Fees									200,915	140,042	55,912
Performance Fee Compensation - Unrealized Carried Interest									966,717	321,599	237,945
Performance Fee Compensation - Unrealized Incentive Fees									(11,651)	(44,528)	(20,759)
Total Compensation and Benefits									3,257,667	2,605,244	2,738,425
Total Expenses	1,330,472	786,405	914,762	835,101	885,679	851,390	739,819	783,793	3,866,740	3,260,681	3,388,069
Economic Income (Loss)									3,148,561	1,014,905	77,258
Segment Assets	29,678,606				28,931,552				29,678,606	28,931,552
Operating Segments
Segment Reporting Information [Line Items]
Management and Advisory Fees, Base Management Fees									1,740,807	1,591,403	1,281,185
Management and Advisory Fees, Advisory Fees									410,514	357,417	382,240
Management and Advisory Fees, Transaction and Other Fees, Net									206,977	227,119	247,513
Management and Advisory Fees, Management Fee Offsets									(72,220)	(40,953)	(33,393)
Total Management and Advisory Fees, Net									2,286,078	2,134,986	1,877,545
Performance Fees Realized - Carried Interest									943,958	327,422	138,907
Performance Fees Realized - Incentive Fees									474,333	301,464	89,029
Performance Fees Unrealized - Carried Interest									2,158,010	994,190	971,518
Performance Fees Unrealized - Incentive Fees									(19,928)	(29,311)	(24,928)
Total Performance Fees									3,556,373	1,593,765	1,174,526
Investment Income (Loss), Realized									170,471	95,398	102,575
Investment Income (Loss), Unrealized									517,334	190,846	82,689
Total Investment Income (Loss)									687,805	286,244	185,264
Interest and Dividend Revenue									70,936	46,630	38,844
Other									10,308	5,149	7,415
Total Revenues									6,611,500	4,066,774	3,283,594
Compensation									1,115,640	1,030,776	960,569
Performance Fee Compensation - Realized Carried Interest									257,201	96,433	43,615
Performance Fee Compensation - Realized Incentive Fees									200,915	140,042	55,912
Performance Fee Compensation - Unrealized Carried Interest									966,717	321,599	237,944
Performance Fee Compensation - Unrealized Incentive Fees									(11,651)	(44,528)	(20,759)
Total Compensation and Benefits									2,528,822	1,544,322	1,277,281
Other Operating Expenses									486,639	481,445	421,342
Total Expenses									3,015,461	2,025,767	1,698,623
Economic Income (Loss)									3,596,039	2,041,007	1,584,971
Segment Assets	16,429,521				13,855,479				16,429,521	13,855,479
Operating Segments | Private Equity
Segment Reporting Information [Line Items]
Management and Advisory Fees, Base Management Fees									368,146	348,594	331,997
Management and Advisory Fees, Transaction and Other Fees, Net									96,988	100,080	133,004
Management and Advisory Fees, Management Fee Offsets									(5,683)	(5,926)	(27,073)
Total Management and Advisory Fees, Net									459,451	442,748	437,928
Performance Fees Realized - Carried Interest									329,993	109,797	37,393
Performance Fees Unrealized - Carried Interest									398,232	148,381	33,490
Total Performance Fees									728,225	258,178	70,883
Investment Income (Loss), Realized									88,026	25,823	44,988
Investment Income (Loss), Unrealized									161,749	85,337	9,476
Total Investment Income (Loss)									249,775	111,160	54,464
Interest and Dividend Revenue									15,602	13,556	13,749
Other									4,259	2,417	1,810
Total Revenues									1,457,312	828,059	578,834
Compensation									236,120	222,709	217,556
Performance Fee Compensation - Realized Carried Interest									38,953	3,679	1,465
Performance Fee Compensation - Unrealized Carried Interest									342,733	58,555	(2,229)
Total Compensation and Benefits									617,806	284,943	216,792
Other Operating Expenses									124,137	130,845	120,918
Total Expenses									741,943	415,788	337,710
Economic Income (Loss)									715,369	412,271	241,124
Segment Assets	4,444,227				4,625,310				4,444,227	4,625,310
Operating Segments | Real Estate
Segment Reporting Information [Line Items]
Management and Advisory Fees, Base Management Fees									565,182	551,322	394,778
Management and Advisory Fees, Transaction and Other Fees, Net									79,675	85,681	109,510
Management and Advisory Fees, Management Fee Offsets									(22,821)	(28,609)	(4,950)
Total Management and Advisory Fees, Net									622,036	608,394	499,338
Performance Fees Realized - Carried Interest									486,773	165,114	22,844
Performance Fees Realized - Incentive Fees									45,862	25,656	9,629
Performance Fees Unrealized - Carried Interest									1,651,700	683,764	913,418
Performance Fees Unrealized - Incentive Fees									(28,753)	(119)	3,658
Total Performance Fees									2,155,582	874,415	949,549
Investment Income (Loss), Realized									52,359	45,302	27,972
Investment Income (Loss), Unrealized									350,201	90,875	92,648
Total Investment Income (Loss)									402,560	136,177	120,620
Interest and Dividend Revenue									21,563	14,448	12,902
Other									3,384	894	(1,061)
Total Revenues									3,205,125	1,634,328	1,581,348
Compensation									294,222	271,122	236,771
Performance Fee Compensation - Realized Carried Interest									148,837	62,418	10,103
Performance Fee Compensation - Realized Incentive Fees									23,878	13,060	4,564
Performance Fee Compensation - Unrealized Carried Interest									566,837	165,482	221,140
Performance Fee Compensation - Unrealized Incentive Fees									(15,015)	(583)	3,106
Total Compensation and Benefits									1,018,759	511,499	475,684
Other Operating Expenses									116,391	123,714	103,859
Total Expenses									1,135,150	635,213	579,543
Economic Income (Loss)									2,069,975	999,115	1,001,805
Segment Assets	7,496,591				5,599,759				7,496,591	5,599,759
Operating Segments | Hedge Fund Solutions
Segment Reporting Information [Line Items]
Management and Advisory Fees, Base Management Fees									409,321	346,210	315,863
Management and Advisory Fees, Transaction and Other Fees, Net									623	188	2,798
Management and Advisory Fees, Management Fee Offsets									(3,387)	(1,414)	(980)
Total Management and Advisory Fees, Net									406,557	344,984	317,681
Performance Fees Realized - Incentive Fees									207,735	83,433	11,472
Performance Fees Unrealized - Incentive Fees									7,718	9,042	774
Total Performance Fees									215,453	92,475	12,246
Investment Income (Loss), Realized									27,613	7,270	17,722
Investment Income (Loss), Unrealized									(9,306)	8,517	(19,031)
Total Investment Income (Loss)									18,307	15,787	(1,309)
Interest and Dividend Revenue									7,605	2,139	2,025
Other									688	3,816	7,902
Total Revenues									648,610	459,201	338,545
Compensation									136,470	119,731	128,959
Performance Fee Compensation - Realized Incentive Fees									65,793	23,080	3,498
Performance Fee Compensation - Unrealized Incentive Fees									2,856	1,317	234
Total Compensation and Benefits									205,119	144,128	132,691
Other Operating Expenses									66,966	57,809	65,072
Total Expenses									272,085	201,937	197,763
Economic Income (Loss)									376,525	257,264	140,782
Segment Assets	1,325,631				876,881				1,325,631	876,881
Operating Segments | Credit
Segment Reporting Information [Line Items]
Management and Advisory Fees, Base Management Fees									398,158	345,277	238,547
Management and Advisory Fees, Transaction and Other Fees, Net									28,586	40,875	1,880
Management and Advisory Fees, Management Fee Offsets									(40,329)	(5,004)	(390)
Total Management and Advisory Fees, Net									386,415	381,148	240,037
Performance Fees Realized - Carried Interest									127,192	52,511	78,670
Performance Fees Realized - Incentive Fees									220,736	192,375	67,928
Performance Fees Unrealized - Carried Interest									108,078	162,045	24,610
Performance Fees Unrealized - Incentive Fees									1,107	(38,234)	(29,360)
Total Performance Fees									457,113	368,697	141,848
Investment Income (Loss), Realized									4,098	15,611	11,299
Investment Income (Loss), Unrealized									13,951	4,769	(708)
Total Investment Income (Loss)									18,049	20,380	10,591
Interest and Dividend Revenue									18,146	9,330	3,369
Other									527	(1,174)	(853)
Total Revenues									880,250	778,381	394,992
Compensation									186,514	182,077	128,588
Performance Fee Compensation - Realized Carried Interest									69,411	30,336	32,047
Performance Fee Compensation - Realized Incentive Fees									111,244	103,902	47,850
Performance Fee Compensation - Unrealized Carried Interest									57,147	97,562	19,033
Performance Fee Compensation - Unrealized Incentive Fees									508	(45,262)	(24,099)
Total Compensation and Benefits									424,824	368,615	203,419
Other Operating Expenses									96,940	84,488	49,955
Total Expenses									521,764	453,103	253,374
Economic Income (Loss)									358,486	325,278	141,618
Segment Assets	2,381,603				2,004,529				2,381,603	2,004,529
Operating Segments | Financial Advisory
Segment Reporting Information [Line Items]
Management and Advisory Fees, Advisory Fees									410,514	357,417	382,240
Management and Advisory Fees, Transaction and Other Fees, Net									1,105	295	321
Total Management and Advisory Fees, Net									411,619	357,712	382,561
Investment Income (Loss), Realized									(1,625)	1,392	594
Investment Income (Loss), Unrealized									739	1,348	304
Total Investment Income (Loss)									(886)	2,740	898
Interest and Dividend Revenue									8,020	7,157	6,799
Other									1,450	(804)	(383)
Total Revenues									420,203	366,805	389,875
Compensation									262,314	235,137	248,695
Total Compensation and Benefits									262,314	235,137	248,695
Other Operating Expenses									82,205	84,589	81,538
Total Expenses									344,519	319,726	330,233
Economic Income (Loss)									75,684	47,079	59,642
Segment Assets	$ 781,469				$ 749,000				$ 781,469	$ 749,000