Earnings per Share - Diluted Net Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Diluted Net Income [Abstract]
Less: Net Income Attributable to Non-Controlling Interests	$ 15,667	$ 20,842
Net Income of Pzena Investment Management, Inc.	2,815	4,187
Diluted Net Income	13,489	19,731
Pzena Investment Management, LLC
Diluted Net Income [Abstract]
Net Income Attributable to Non-Controlling Interests	14,823	20,648
Less: Assumed Corporate Income Taxes	4,149	5,104
Less: Net Income Attributable to Non-Controlling Interests	10,674	15,544
Net Income of Pzena Investment Management, Inc.	2,815	4,187
Diluted Net Income	$ 13,489	$ 19,731