Quarterly report pursuant to Section 13 or 15(d)

Revenue - Summary of Disaggregation of Revenue, Fund Management Fees (Detail)

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Revenue - Summary of Disaggregation of Revenue, Fund Management Fees (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue $ 92,171 $ 51,352 $ 222,695 $ 160,203
Fund Management Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 40,576 26,624 105,963 78,066
Funds [Member] | Fund Management Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 38,827 25,152 101,808 73,791
Joint Ventures and Separately Managed Accounts [Member] | Fund Management Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue $ 1,749 $ 1,472 $ 4,155 $ 4,275