v2.4.0.8
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