Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2022		Mar. 31, 2022	Dec. 31, 2021		Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents
Cash	$ 49,412	[1]	$ 35,576	$ 81,133	[1]	$ 53,463	$ 29,650	$ 65,534
Restricted Cash	2,215		2,214	1,056		1,054	1,054	1,050
Total	$ 51,627		$ 37,790	$ 82,189		$ 54,517	$ 30,704	$ 66,584

[1] Asset and liability amounts in parentheses represent the aggregated balances at June 30, 2022 and December 31, 2021 attributable to Pzena U.S. Best Ideas (GP), LLC and Pzena Global Best Ideas (GP), LLC, which were variable interest entities as of June 30, 2022 and December 31, 2021. Asset and liability amounts in parentheses at June 30, 2022 are also attributable to Pzena 320 Fund (GP), LLC. Asset and liability amounts in parentheses at December 31, 2021 are also attributable to Pzena Global Focus Value Fund.