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Business Combinations - Summary of Preliminary Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Mar. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill   $ 800,267 $ 774,534
H G P E Capital Limited      
Business Acquisition [Line Items]      
Cash and Cash Equivalents $ 14,000    
Other Current Assets 11,300    
Goodwill 19,100    
Intangible Assets 27,600    
Other Long-Term Assets 9,800    
Less: Liabilities Acquired (26,900)    
Less: Fair Value of Redeemable Noncontrolling Interest in Subsidiary (34,500)    
Total Purchase Price Consideration 20,400    
Receivables 4,600    
H G P E Capital Limited | Customer Relationships      
Business Acquisition [Line Items]      
Customer relationships $ 20,300    
Weighted-average useful life 9 years    
H G P E Capital Limited | Rights to Manage Fund Assets      
Business Acquisition [Line Items]      
Customer relationships $ 6,900    
Weighted-average useful life 11 years