Shareholders' Equity (Details)				12 Months Ended
	Dec. 22, 2021 shares	Jun. 10, 2021 shares	Dec. 22, 2020 shares	Dec. 31, 2021 USD ($) Vote $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Jul. 20, 2021 USD ($)	Apr. 19, 2018 USD ($)	Feb. 05, 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
Sale of Shares Under Equity Incentive Plan | $				$ 315,000	$ 2,295,000
Class B unit exchange for Company Class A common stock
Class of Stock [Line Items]
Number of class B units exchanged for equivalent class A common shares (in shares)	30,414	760,000	494,316
Common Class A
Class of Stock [Line Items]
Economic interest held in company by class of stock (in hundredths)				23.50%	24.20%
Percentage of right to future income and distributions				21.60%	22.40%
Par value (in dollars per share) | $ / shares				$ 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)				865,556	1,211,573
Purchased under repurchase authorization at an average price per share (in dollars per share) | $ / shares				$ 9.99	$ 6.32
Common Class A | Common Stock
Class of Stock [Line Items]
Common stock purchased and retired (in shares)				865,556	(1,211,573)
Common Class B
Class of Stock [Line Items]
Percentage of right to future income and distributions				69.30%	70.10%
Par value (in dollars per share) | $ / shares				$ 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)				64,077	107,204
Purchased under repurchase authorization at an average price per share (in dollars per share) | $ / shares				$ 7.66	$ 5.97
Sale of Shares Under Equity Incentive Plan (in shares)				49,081	554,860
Common Class B | Common Stock
Class of Stock [Line Items]
Common stock purchased and retired (in shares)				64,077	(107,204)
Sale of Shares Under Equity Incentive Plan (in shares)				49,081	554,860
Class B-1 Unit
Class of Stock [Line Items]
Percentage of right to future income and distributions				9.10%	7.50%
Voting rights (in votes) | Vote				0
Number of shares issued				0
Pzena Investment Management, LLC | Common Class B
Class of Stock [Line Items]
Economic interest held in company by class of stock (in hundredths)				74.90%	75.80%
Pzena Investment Management, LLC | Class B-1 Unit
Class of Stock [Line Items]
Economic interest held in company by class of stock (in hundredths)				1.60%