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Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Investment advisory fees	$ 37,065	$ 39,580	$ 112,318	$ 117,180
Loan write-off period			7 years
VIEs That are Not Consolidated
Related Party Transaction [Line Items]
Investment advisory fees	300	300	$ 900	800
Employees
Related Party Transaction [Line Items]
Loans to employees	1,600		1,600		$ 1,300
Pzena Mutual Funds
Related Party Transaction [Line Items]
Investment advisory fees waived	300	200	800	800
Company's Executive Officers and Other Employees
Related Party Transaction [Line Items]
Investment advisory fees waived	$ 200	$ 200	$ 500	$ 500