Non-Controlling Interests (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Noncontrolling Interest [Line Items]
Non-Controlling Interests	$ 87,798	$ 42,664
Non-Controlling Interests of Pzena Investment Management, LLC
Noncontrolling Interest [Line Items]
Non-Controlling Interests	86,781	42,421
Non-Controlling Interests of Consolidated Subsidiaries
Noncontrolling Interest [Line Items]
Non-Controlling Interests	$ 1,017	$ 243