Related Parties - Schedule of Payable to Employees and Related Parties (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Related Party Transactions [Abstract]
Amount Due to U.K. Members	$ 20,221	$ 13,606
Amounts Due Pursuant to Tax Receivable Agreements	10,465	9,891
Amounts Due to Employees for the Sale of Outstanding Class R Interests of Private Capital Advisory L.P.	27,710	0
Other	480	550
Payable to Employees and Related Parties	58,876	24,047
Amounts Due Pursuant to Tax Receivable Agreements	70,209	$ 76,860
Other Noncurrent Liabilities
Related Party Transaction [Line Items]
Noncontrolling Interest, Purchase of Interest, Contingent Consideration, Liability, Noncurrent	$ 20,587