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Segment Reporting - Adjustments for Compensation and Performance Fees Allocated (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Performance fees      
Realized $ 907.5 $ 1,307.4 $ 266.4
Unrealized 133.6 (185.8) 1,215.6
Total performance fees 1,041.1 1,121.6 1,482.0
Performance fee related compensation expense      
Realized 285.5 225.7 46.6
Unrealized 32.2 (122.3) 117.2
Net performance fees      
Total net performance fees 524.6 630.4 743.8
Carlyle Consolidated [Member]
     
Performance fees      
Realized 907.5 1,307.4 266.4
Unrealized 133.6 (185.8) 1,215.6
Total performance fees 1,041.1 1,121.6 1,482.0
Performance fee related compensation expense      
Realized 285.5 225.7 46.6
Unrealized 32.2 (122.3) 117.2
Total performance fee related compensation expense 317.7 103.4 163.8
Net performance fees      
Realized 622.0 1,081.7 219.8
Unrealized 101.4 (63.5) 1,098.4
Total net performance fees 723.4 1,018.2 1,318.2
Investment income (loss)      
Realized 16.3 65.1 11.9
Unrealized 20.1 13.3 60.7
Total investment income (loss) 36.4 78.4 72.6
Adjustments [Member]
     
Performance fees      
Realized (38.4) (6.1) 7.8
Unrealized (6.7) (9.3) (11.5)
Total performance fees (45.1) (15.4) (3.7)
Performance fee related compensation expense      
Realized 81.5 398.1 94.1
Unrealized 72.2 (25.7) 476.6
Total performance fee related compensation expense 153.7 372.4 570.7
Net performance fees      
Realized (119.9) (404.2) (86.3)
Unrealized (78.9) 16.4 (488.1)
Total net performance fees (198.8) (387.8) (574.4)
Investment income (loss)      
Realized   0.5 (1.5)
Unrealized 5.1 2.5 0.5
Total investment income (loss) 5.1 3.0 (1.0)
Total Reportable Segment [Member]
     
Performance fees      
Realized 869.1 1,301.3 274.2
Unrealized 126.9 (195.1) 1,204.1
Total performance fees 996.0 1,106.2 1,478.3
Performance fee related compensation expense      
Realized 367.0 623.8 140.7
Unrealized 104.4 (148.0) 593.8
Total performance fee related compensation expense 471.4 475.8 734.5
Net performance fees      
Realized 502.1 677.5 133.5
Unrealized 22.5 (47.1) 610.3
Total net performance fees 524.6 630.4 743.8
Investment income (loss)      
Realized 16.3 65.6 10.4
Unrealized 25.2 15.8 61.2
Total investment income (loss) $ 41.5 $ 81.4 $ 71.6