Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Revenue $ 330,014 $ 231,948 $ 246,276
Fund Management Fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 155,928 110,235 118,194
Funds [Member] | Fund Management Fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 150,418 104,571 113,676
Joint Ventures and Separately Managed Accounts [Member] | Fund Management Fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue $ 5,510 $ 5,664 $ 4,518