Shareholders' Equity (Details)	6 Months Ended
	Jun. 30, 2022 Vote $ / shares shares	Jun. 30, 2021 $ / shares shares	Dec. 31, 2021 $ / shares	Jul. 20, 2021 USD ($)	Apr. 19, 2018 USD ($)	Feb. 11, 2014 USD ($)	Apr. 24, 2012 USD ($)
Class of Stock [Line Items]
Amount authorized under stock repurchase program | $				$ 40,000,000	$ 30,000,000	$ 20,000,000	$ 10,000,000
Common Class A
Class of Stock [Line Items]
Economic interest held in company by class of stock (in hundredths)	22.70%		23.50%
Percentage of right to future income and distributions	20.10%		21.60%
Par value (in dollars per share)	$ 0.01		$ 0.01
Percentage of outstanding shares that represents rights of holders to receive distribution (in hundredths)	100.00%
Common stock purchased and retired (in shares) | shares	658,319	372,874
Purchased under repurchase authorization at an average price per share (in dollars per share)	$ 7.78	$ 9.21
Common Class B
Class of Stock [Line Items]
Percentage of right to future income and distributions	68.40%		69.30%
Par value (in dollars per share)	$ 0.000001		$ 0.000001
Voting rights (in votes) | Vote	5
Percentage of stock holding that will entitle holders to one vote (in hundredths)	20.00%
Voting rights when class of stock constitutes less than 20% of all shares outstanding (in votes) | Vote	1
Common stock purchased and retired (in shares) | shares	9,819	21,266
Purchased under repurchase authorization at an average price per share (in dollars per share)	$ 6.51	$ 5.75
Class B-1 Units
Class of Stock [Line Items]
Percentage of right to future income and distributions	11.50%		9.10%
Voting rights (in votes) | Vote	0
Number of shares issued | shares	0
Pzena Investment Management, LLC | Common Class B
Class of Stock [Line Items]
Economic interest held in company by class of stock (in hundredths)	77.30%		74.90%
Pzena Investment Management, LLC | Class B-1 Units
Class of Stock [Line Items]
Economic interest held in company by class of stock (in hundredths)	0.00%		1.60%