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Accrued Performance Fees - Components of Accrued Giveback Obligations (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Accrued giveback obligations $ (252.0) $ (104.4)
Corporate Private Equity    
Segment Reporting Information [Line Items]    
Accrued giveback obligations (36.6) (52.4)
Real Assets    
Segment Reporting Information [Line Items]    
Accrued giveback obligations $ (215.4) $ (52.0)