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Revenue from Contracts with Customers - Disaggregation of Revenue by Performance Obligation (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Total Revenue $ 363,918 $ 364,455 $ 360,712 $ 359,183 $ 358,025 $ 340,340 $ 321,479 $ 307,050 $ 1,448,268 $ 1,326,894 $ 1,135,677
Asset Management                      
Disaggregation of Revenue [Line Items]                      
Total Revenue                 1,011,467 907,605 773,418
Administrative Services                      
Disaggregation of Revenue [Line Items]                      
Total Revenue                 318,152 245,887 199,269
Distribution                      
Disaggregation of Revenue [Line Items]                      
Total Revenue                 92,922 151,106 146,595
Other                      
Disaggregation of Revenue [Line Items]                      
Total Revenue                 $ 25,727 $ 22,296 $ 16,395