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

[1] Asset and liability amounts in parentheses represent the aggregated balances at March 31, 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 March 31, 2022 and December 31, 2021. Asset and liability amounts in parentheses at December 31, 2021 are also attributable to Pzena Global Focus Value Fund.