Earnings per Share - Diluted Net Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Diluted Net Income [Abstract]
Less: Net Income Attributable to Non-Controlling Interests	$ 11,916	$ 22,474	$ 27,583	$ 43,316
Net Income of Pzena Investment Management, Inc.	2,523	4,603	5,338	8,790
Diluted Net Income	12,755	21,176	26,245	40,906
Pzena Investment Management, LLC
Diluted Net Income [Abstract]
Net Income Attributable to Non-Controlling Interests	14,090	22,225	28,913	42,873
Less: Assumed Corporate Income Taxes	3,858	5,652	8,006	10,757
Less: Net Income Attributable to Non-Controlling Interests	10,232	16,573	20,907	32,116
Net Income of Pzena Investment Management, Inc.	2,523	4,603	5,338	8,790
Diluted Net Income	$ 12,755	$ 21,176	$ 26,245	$ 40,906