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Revenue from Contracts with Customers - Disaggregation of Revenue by Asset Class (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Total Revenue $ 1,300,447 $ 1,448,268 $ 1,326,894
Equity      
Disaggregation of Revenue [Line Items]      
Total Revenue 677,917 551,028 533,749
Money market      
Disaggregation of Revenue [Line Items]      
Total Revenue 239,318 570,815 529,340
Fixed-income      
Disaggregation of Revenue [Line Items]      
Total Revenue 237,702 193,649 179,102
Other      
Disaggregation of Revenue [Line Items]      
Total Revenue $ 145,510 $ 132,776 $ 84,703