v2.4.0.6
Financial Data of Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting Information [Line Items]        
Total Management and Advisory Fees, Net $ 488,048 $ 498,040 $ 959,724 $ 910,778
Performance Fees Realized - Carried Interest 55,929 42,750 69,489 136,153
Performance Fees Realized - Incentive Fees 11,631 19,013 16,910 21,813
Performance Fees Unrealized - Carried Interest 84,290 611,158 383,086 1,043,305
Performance Fees Unrealized - Incentive Fees (16,436) (670) 50,699 79,584
Total Performance Fees 135,414 672,251 520,184 1,280,855
Investment Income (Loss), Realized 5,758 19,303 22,093 32,086
Investment Income (Loss), Unrealized (10,519) 108,711 62,307 216,106
Total Investment Income (Loss) (4,761) 128,014 84,400 248,192
Interest and Dividend Revenue 9,267 8,848 16,903 18,338
Other (765) 1,128 (1,972) 3,387
Total Revenues 627,203 1,308,281 1,579,239 2,461,550
Compensation 533,367 699,432 1,028,622 1,358,915
Performance Fee Compensation - Realized Carried Interest 7,898 18,676 15,836 32,243
Performance Fee Compensation - Realized Incentive Fees 5,576 9,036 9,828 10,012
Performance Fee Compensation - Unrealized Carried Interest 36,815 123,714 121,359 249,670
Performance Fee Compensation - Unrealized Incentive Fees (9,595) (5,616) 3,183 30,953
Total Compensation and Benefits 574,061 845,242 1,178,828 1,681,793
Total Expenses 739,819 984,831 1,523,612 1,975,695
Economic Income 221,717 817,078 721,985 1,476,749
Private Equity
        
Segment Reporting Information [Line Items]        
Management and Advisory Fees, Base Management Fees 87,475 82,297 173,264 162,232
Management and Advisory Fees, Transaction and Other Fees, Net 14,951 52,353 33,048 87,695
Management and Advisory Fees, Management Fee Offsets (672) (7,629) (4,454) (15,518)
Total Management and Advisory Fees, Net 101,754 127,021 201,858 234,409
Performance Fees Realized - Carried Interest 28,781 1,362 32,714 83,751
Performance Fees Unrealized - Carried Interest (87,893) 187,190 (53,842) 219,727
Total Performance Fees (59,112) 188,552 (21,128) 303,478
Investment Income (Loss), Realized (6,195) 3,021 7,716 20,928
Investment Income (Loss), Unrealized (28,337) 76,947 (11,868) 106,073
Total Investment Income (Loss) (34,532) 79,968 (4,152) 127,001
Interest and Dividend Revenue 3,114 3,197 5,534 6,702
Other 562 665 347 1,476
Total Revenues 11,786 399,403 182,459 673,066
Compensation 53,775 64,633 106,322 119,557
Performance Fee Compensation - Realized Carried Interest 804 49 1,124 7,767
Performance Fee Compensation - Unrealized Carried Interest (8,259) 29,309 (9,311) 34,773
Total Compensation and Benefits 46,320 93,991 98,135 162,097
Other Operating Expenses 30,521 30,124 59,402 58,837
Total Expenses 76,841 124,115 157,537 220,934
Economic Income (65,055) 275,288 24,922 452,132
Segment Assets 3,736,660   3,736,660  
Real Estate
        
Segment Reporting Information [Line Items]        
Management and Advisory Fees, Base Management Fees 127,817 97,467 275,619 192,906
Management and Advisory Fees, Transaction and Other Fees, Net 25,151 49,288 39,563 70,831
Management and Advisory Fees, Management Fee Offsets (5,357) (745) (13,984) (1,250)
Total Management and Advisory Fees, Net 147,611 146,010 301,198 262,487
Performance Fees Realized - Carried Interest 13,539 11,798 22,156 14,169
Performance Fees Realized - Incentive Fees 7,766 9,034 7,765 9,256
Performance Fees Unrealized - Carried Interest 144,510 433,280 366,010 794,726
Performance Fees Unrealized - Incentive Fees (1,526) (3,822) 6,388 2,836
Total Performance Fees 164,289 450,290 402,319 820,987
Investment Income (Loss), Realized 9,067 11,394 16,879 14,313
Investment Income (Loss), Unrealized 14,944 37,332 40,856 98,738
Total Investment Income (Loss) 24,011 48,726 57,735 113,051
Interest and Dividend Revenue 3,277 2,989 5,829 6,277
Other (590) 515 (1,299) 1,375
Total Revenues 338,598 648,530 765,782 1,204,177
Compensation 76,576 70,651 145,465 128,278
Performance Fee Compensation - Realized Carried Interest 3,401 5,095 7,478 6,221
Performance Fee Compensation - Realized Incentive Fees 3,871 4,287 3,873 4,391
Performance Fee Compensation - Unrealized Carried Interest 31,677 92,392 85,952 193,350
Performance Fee Compensation - Unrealized Incentive Fees (629) (1,371) 3,139 4,172
Total Compensation and Benefits 114,896 171,054 245,907 336,412
Other Operating Expenses 26,560 22,971 55,484 51,337
Total Expenses 141,456 194,025 301,391 387,749
Economic Income 197,142 454,505 464,391 816,428
Segment Assets 4,495,602   4,495,602  
Hedge Fund Solutions
        
Segment Reporting Information [Line Items]        
Management and Advisory Fees, Base Management Fees 84,278 79,290 166,099 154,902
Management and Advisory Fees, Transaction and Other Fees, Net 65 861 157 1,588
Management and Advisory Fees, Management Fee Offsets (375) (196) (710) (320)
Total Management and Advisory Fees, Net 83,968 79,955 165,546 156,170
Performance Fees Realized - Incentive Fees 1,175 667 4,473 1,560
Performance Fees Unrealized - Incentive Fees (10,981) 3,441 12,206 22,694
Total Performance Fees (9,806) 4,108 16,679 24,254
Investment Income (Loss), Realized 929 12,855 1,432 14,196
Investment Income (Loss), Unrealized (3,636) (12,864) 4,735 (5,744)
Total Investment Income (Loss) (2,707) (9) 6,167 8,452
Interest and Dividend Revenue 495 472 881 988
Other 27 (38) (100) 66
Total Revenues 71,977 84,488 189,173 189,930
Compensation 34,559 31,674 62,792 59,767
Performance Fee Compensation - Realized Incentive Fees (345) 253 1,033 553
Performance Fee Compensation - Unrealized Incentive Fees (2,820) 2,955 4,474 8,313
Total Compensation and Benefits 31,394 34,882 68,299 68,633
Other Operating Expenses 14,506 16,075 28,440 29,083
Total Expenses 45,900 50,957 96,739 97,716
Economic Income 26,077 33,531 92,434 92,214
Segment Assets 794,310   794,310  
Credit Businesses
        
Segment Reporting Information [Line Items]        
Management and Advisory Fees, Base Management Fees 81,774 57,420 161,868 112,021
Management and Advisory Fees, Transaction and Other Fees, Net 9,184 849 14,909 1,594
Management and Advisory Fees, Management Fee Offsets (1,569) (105) (1,875) (123)
Total Management and Advisory Fees, Net 89,389 58,164 174,902 113,492
Performance Fees Realized - Carried Interest 13,609 29,592 14,619 38,233
Performance Fees Realized - Incentive Fees 2,751 7,762 4,733 8,846
Performance Fees Unrealized - Carried Interest 27,673 (9,313) 70,918 28,852
Performance Fees Unrealized - Incentive Fees (4,567) 2,067 32,453 49,205
Total Performance Fees 39,466 30,108 122,723 125,136
Investment Income (Loss), Realized 5,638 3,236 6,321 4,471
Investment Income (Loss), Unrealized (9,156) 5,437 55 9,969
Total Investment Income (Loss) (3,518) 8,673 6,376 14,440
Interest and Dividend Revenue 1,752 902 4,177 1,355
Other (787) (47) (1,025) 51
Total Revenues 126,302 97,800 307,153 254,474
Compensation 42,845 33,071 79,988 62,620
Performance Fee Compensation - Realized Carried Interest 3,694 13,531 7,235 18,256
Performance Fee Compensation - Realized Incentive Fees 2,049 4,496 4,921 5,066
Performance Fee Compensation - Unrealized Carried Interest 13,397 2,012 44,717 21,545
Performance Fee Compensation - Unrealized Incentive Fees (6,147) (7,200) (4,430) 18,469
Total Compensation and Benefits 55,838 45,910 132,431 125,956
Other Operating Expenses 15,749 10,226 32,845 25,583
Total Expenses 71,587 56,136 165,276 151,539
Economic Income 54,715 41,664 141,877 102,935
Segment Assets 1,881,416   1,881,416  
Financial Advisory
        
Segment Reporting Information [Line Items]        
Management and Advisory Fees, Advisory Fees 93,372 102,243 169,218 172,495
Management and Advisory Fees, Transaction and Other Fees, Net 102 210 247 216
Total Management and Advisory Fees, Net 93,474 102,453 169,465 172,711
Investment Income (Loss), Realized (79) 226 504 323
Investment Income (Loss), Unrealized 561 (15) 512 378
Total Investment Income (Loss) 482 211 1,016 701
Interest and Dividend Revenue 1,753 1,723 3,315 3,409
Other (40) 33 42 419
Total Revenues 95,669 104,420 173,838 177,240
Compensation 61,129 72,363 129,089 126,702
Total Compensation and Benefits 61,129 72,363 129,089 126,702
Other Operating Expenses 25,702 19,967 46,388 37,498
Total Expenses 86,831 92,330 175,477 164,200
Economic Income 8,838 12,090 (1,639) 13,040
Segment Assets 575,373   575,373  
Total Segments
        
Segment Reporting Information [Line Items]        
Management and Advisory Fees, Base Management Fees 381,344 316,474 776,850 622,061
Management and Advisory Fees, Advisory Fees 93,372 102,243 169,218 172,495
Management and Advisory Fees, Transaction and Other Fees, Net 49,453 103,561 87,924 161,924
Management and Advisory Fees, Management Fee Offsets (7,973) (8,675) (21,023) (17,211)
Total Management and Advisory Fees, Net 516,196 513,603 1,012,969 939,269
Performance Fees Realized - Carried Interest 55,929 42,752 69,489 136,153
Performance Fees Realized - Incentive Fees 11,692 17,463 16,971 19,662
Performance Fees Unrealized - Carried Interest 84,290 611,157 383,086 1,043,305
Performance Fees Unrealized - Incentive Fees (17,074) 1,686 51,047 74,735
Total Performance Fees 134,837 673,058 520,593 1,273,855
Investment Income (Loss), Realized 9,360 30,732 32,852 54,231
Investment Income (Loss), Unrealized (25,624) 106,837 34,290 209,414
Total Investment Income (Loss) (16,264) 137,569 67,142 263,645
Interest and Dividend Revenue 10,391 9,283 19,736 18,731
Other (828) 1,128 (2,035) 3,387
Total Revenues 644,332 1,334,641 1,618,405 2,498,887
Compensation 268,884 272,392 523,656 496,924
Performance Fee Compensation - Realized Carried Interest 7,899 18,675 15,837 32,244
Performance Fee Compensation - Realized Incentive Fees 5,575 9,036 9,827 10,010
Performance Fee Compensation - Unrealized Carried Interest 36,815 123,713 121,358 249,668
Performance Fee Compensation - Unrealized Incentive Fees (9,596) (5,616) 3,183 30,954
Total Compensation and Benefits 309,577 418,200 673,861 819,800
Other Operating Expenses 113,038 99,363 222,559 202,338
Total Expenses 422,615 517,563 896,420 1,022,138
Economic Income 221,717 817,078 721,985 1,476,749
Segment Assets $ 11,483,361   $ 11,483,361