v2.4.0.8
Financial Data of Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information [Line Items]        
Total Management and Advisory Fees, Net $ 531,095 $ 469,109 $ 1,591,951 $ 1,428,833
Performance Fees Realized - Carried Interest 182,654 83,765 660,112 153,254
Performance Fees Realized - Incentive Fees 30,884 11,588 130,729 28,497
Performance Fees Unrealized - Carried Interest 290,052 403,465 924,105 786,551
Performance Fees Unrealized - Incentive Fees 37,713 104,312 144,449 155,011
Total Performance Fees 541,303 603,130 1,859,395 1,123,313
Investment Income (Loss), Realized 19,507 18,559 137,350 40,652
Investment Income (Loss), Unrealized 100,341 119,599 263,141 181,906
Total Investment Income (Loss) 119,848 138,158 400,491 222,558
Interest and Dividend Revenue 19,892 10,278 46,263 27,181
Other 4,707 2,415 5,688 443
Total Revenues 1,216,845 1,223,090 3,903,788 2,802,328
Compensation 465,631 503,295 1,396,042 1,531,917
Performance Fee Compensation - Realized Carried Interest 60,369 22,023 225,716 37,860
Performance Fee Compensation - Realized Incentive Fees 14,599 4,457 60,121 14,284
Performance Fee Compensation - Unrealized Carried Interest 82,341 128,863 350,637 250,221
Performance Fee Compensation - Unrealized Incentive Fees 11,084 44,254 58,646 47,437
Total Compensation and Benefits 634,024 702,892 2,091,162 1,881,719
Total Expenses 786,405 851,391 2,536,268 2,375,002
Economic Income 518,392 235,739 1,563,648 827,738
Segment Assets 28,034,882   28,034,882  
Operating Segments
        
Segment Reporting Information [Line Items]        
Management and Advisory Fees, Base Management Fees 437,294 398,088 1,271,715 1,174,938
Management and Advisory Fees, Advisory Fees 83,602 59,951 271,356 229,169
Management and Advisory Fees, Transaction and Other Fees, Net 42,806 45,126 147,244 133,050
Management and Advisory Fees, Management Fee Offsets (8,271) (8,454) (28,468) (29,477)
Total Management and Advisory Fees, Net 555,431 494,711 1,661,847 1,507,680
Performance Fees Realized - Carried Interest 182,654 83,765 660,112 153,254
Performance Fees Realized - Incentive Fees 31,238 11,620 130,832 28,591
Performance Fees Unrealized - Carried Interest 290,052 403,465 924,105 786,551
Performance Fees Unrealized - Incentive Fees 40,992 104,149 153,105 155,196
Total Performance Fees 544,936 602,999 1,868,154 1,123,592
Investment Income (Loss), Realized 11,492 25,098 104,188 57,950
Investment Income (Loss), Unrealized 87,680 82,334 226,874 116,624
Total Investment Income (Loss) 99,172 107,432 331,062 174,574
Interest and Dividend Revenue 21,539 12,004 51,542 31,740
Other 4,708 2,477 5,687 442
Total Revenues 1,225,786 1,219,623 3,918,292 2,838,028
Compensation 279,498 259,561 852,952 783,217
Performance Fee Compensation - Realized Carried Interest 60,369 22,023 225,716 37,860
Performance Fee Compensation - Realized Incentive Fees 14,599 4,457 60,121 14,284
Performance Fee Compensation - Unrealized Carried Interest 82,341 128,863 350,637 250,221
Performance Fee Compensation - Unrealized Incentive Fees 11,084 44,254 58,646 47,437
Total Compensation and Benefits 447,891 459,158 1,548,072 1,133,019
Other Operating Expenses 122,872 127,456 357,468 350,015
Total Expenses 570,763 586,614 1,905,540 1,483,034
Economic Income 655,023 633,009 2,012,752 1,354,994
Segment Assets 14,903,518   14,903,518  
Operating Segments | Private Equity
        
Segment Reporting Information [Line Items]        
Management and Advisory Fees, Base Management Fees 95,281 86,136 268,148 259,400
Management and Advisory Fees, Transaction and Other Fees, Net 16,052 25,693 78,853 58,741
Management and Advisory Fees, Management Fee Offsets (2,080) (767) (4,510) (5,221)
Total Management and Advisory Fees, Net 109,253 111,062 342,491 312,920
Performance Fees Realized - Carried Interest 85,121 31,592 228,912 64,306
Performance Fees Unrealized - Carried Interest (86,300) 128,746 12,672 74,904
Total Performance Fees (1,179) 160,338 241,584 139,210
Investment Income (Loss), Realized 11,495 7,189 57,243 14,905
Investment Income (Loss), Unrealized 23,621 43,267 76,420 31,399
Total Investment Income (Loss) 35,116 50,456 133,663 46,304
Interest and Dividend Revenue 5,231 3,413 11,466 8,947
Other 1,521 1,650 2,311 1,997
Total Revenues 149,942 326,919 731,515 509,378
Compensation 55,800 62,424 179,750 168,746
Performance Fee Compensation - Realized Carried Interest 19,824 1,048 36,947 2,172
Performance Fee Compensation - Unrealized Carried Interest (36,198) 43,228 68,532 33,917
Total Compensation and Benefits 39,426 106,700 285,229 204,835
Other Operating Expenses 30,024 30,944 91,370 90,346
Total Expenses 69,450 137,644 376,599 295,181
Economic Income 80,492 189,275 354,916 214,197
Segment Assets 4,231,858   4,231,858  
Operating Segments | Real Estate
        
Segment Reporting Information [Line Items]        
Management and Advisory Fees, Base Management Fees 136,721 135,659 412,067 411,278
Management and Advisory Fees, Transaction and Other Fees, Net 19,205 14,937 47,358 54,500
Management and Advisory Fees, Management Fee Offsets (2,385) (6,034) (15,983) (20,018)
Total Management and Advisory Fees, Net 153,541 144,562 443,442 445,760
Performance Fees Realized - Carried Interest 93,878 51,845 306,132 74,001
Performance Fees Realized - Incentive Fees 3,737 4,879 37,931 12,644
Performance Fees Unrealized - Carried Interest 340,406 207,695 880,454 573,705
Performance Fees Unrealized - Incentive Fees 2,481 6,150 (27,398) 12,538
Total Performance Fees 440,502 270,569 1,197,119 672,888
Investment Income (Loss), Realized 928 10,324 29,039 27,203
Investment Income (Loss), Unrealized 57,656 33,676 148,595 74,532
Total Investment Income (Loss) 58,584 44,000 177,634 101,735
Interest and Dividend Revenue 6,060 3,581 14,754 9,410
Other 2,113 1,941 1,706 642
Total Revenues 660,800 464,653 1,834,655 1,230,435
Compensation 75,346 71,456 218,597 216,921
Performance Fee Compensation - Realized Carried Interest 38,942 19,822 119,810 27,300
Performance Fee Compensation - Realized Incentive Fees 1,919 2,570 19,376 6,443
Performance Fee Compensation - Unrealized Carried Interest 99,323 47,940 266,984 133,892
Performance Fee Compensation - Unrealized Incentive Fees 615 2,876 (14,680) 6,015
Total Compensation and Benefits 216,145 144,664 610,087 390,571
Other Operating Expenses 30,614 31,284 86,693 86,768
Total Expenses 246,759 175,948 696,780 477,339
Economic Income 414,041 288,705 1,137,875 753,096
Segment Assets 6,410,733   6,410,733  
Operating Segments | Hedge Fund Solutions
        
Segment Reporting Information [Line Items]        
Management and Advisory Fees, Base Management Fees 103,392 87,334 296,296 253,433
Management and Advisory Fees, Transaction and Other Fees, Net 295 4 360 161
Management and Advisory Fees, Management Fee Offsets (1,200) (382) (2,238) (1,092)
Total Management and Advisory Fees, Net 102,487 86,956 294,418 252,502
Performance Fees Realized - Incentive Fees 5,320 2,637 32,874 7,110
Performance Fees Unrealized - Incentive Fees 29,208 36,635 105,698 48,841
Total Performance Fees 34,528 39,272 138,572 55,951
Investment Income (Loss), Realized (598) 637 13,922 2,069
Investment Income (Loss), Unrealized 6,439 5,199 (1,702) 9,934
Total Investment Income (Loss) 5,841 5,836 12,220 12,003
Interest and Dividend Revenue 2,523 540 5,617 1,421
Other 595 315 426 215
Total Revenues 145,974 132,919 451,253 322,092
Compensation 37,611 28,826 108,323 91,618
Performance Fee Compensation - Realized Incentive Fees 1,954 1,062 12,092 2,095
Performance Fee Compensation - Unrealized Incentive Fees 10,177 8,062 37,679 12,536
Total Compensation and Benefits 49,742 37,950 158,094 106,249
Other Operating Expenses 19,575 12,878 51,269 41,318
Total Expenses 69,317 50,828 209,363 147,567
Economic Income 76,657 82,091 241,890 174,525
Segment Assets 996,494   996,494  
Operating Segments | Credit
        
Segment Reporting Information [Line Items]        
Management and Advisory Fees, Base Management Fees 101,900 88,959 295,204 250,827
Management and Advisory Fees, Transaction and Other Fees, Net 7,058 4,486 20,434 19,395
Management and Advisory Fees, Management Fee Offsets (2,606) (1,271) (5,737) (3,146)
Total Management and Advisory Fees, Net 106,352 92,174 309,901 267,076
Performance Fees Realized - Carried Interest 3,655 328 125,068 14,947
Performance Fees Realized - Incentive Fees 22,181 4,104 60,027 8,837
Performance Fees Unrealized - Carried Interest 35,946 67,024 30,979 137,942
Performance Fees Unrealized - Incentive Fees 9,303 61,364 74,805 93,817
Total Performance Fees 71,085 132,820 290,879 255,543
Investment Income (Loss), Realized 496 6,697 4,725 13,018
Investment Income (Loss), Unrealized (1,042) (736) 4,432 (681)
Total Investment Income (Loss) (546) 5,961 9,157 12,337
Interest and Dividend Revenue 5,288 2,673 13,906 6,850
Other (357) (678) 408 (1,703)
Total Revenues 181,822 232,950 624,251 540,103
Compensation 53,250 50,236 154,712 130,224
Performance Fee Compensation - Realized Carried Interest 1,603 1,153 68,959 8,388
Performance Fee Compensation - Realized Incentive Fees 10,726 825 28,653 5,746
Performance Fee Compensation - Unrealized Carried Interest 19,216 37,695 15,121 82,412
Performance Fee Compensation - Unrealized Incentive Fees 292 33,316 35,647 28,886
Total Compensation and Benefits 85,087 123,225 303,092 255,656
Other Operating Expenses 23,451 33,527 67,374 66,372
Total Expenses 108,538 156,752 370,466 322,028
Economic Income 73,284 76,198 253,785 218,075
Segment Assets 2,500,468   2,500,468  
Operating Segments | Financial Advisory
        
Segment Reporting Information [Line Items]        
Management and Advisory Fees, Advisory Fees 83,602 59,951 271,356 229,169
Management and Advisory Fees, Transaction and Other Fees, Net 196 6 239 253
Total Management and Advisory Fees, Net 83,798 59,957 271,595 229,422
Investment Income (Loss), Realized (829) 251 (741) 755
Investment Income (Loss), Unrealized 1,006 928 (871) 1,440
Total Investment Income (Loss) 177 1,179 (1,612) 2,195
Interest and Dividend Revenue 2,437 1,797 5,799 5,112
Other 836 (751) 836 (709)
Total Revenues 87,248 62,182 276,618 236,020
Compensation 57,491 46,619 191,570 175,708
Total Compensation and Benefits 57,491 46,619 191,570 175,708
Other Operating Expenses 19,208 18,823 60,762 65,211
Total Expenses 76,699 65,442 252,332 240,919
Economic Income 10,549 (3,260) 24,286 (4,899)
Segment Assets $ 763,965   $ 763,965