Compensation and Benefits - Phantom Units Activity (Details) - $ / shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Bonus plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for units (in years)	4 years
Bonus plan \| Deferred Compensation Phantom Class B Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance (in shares)	472,302	503,869
Ending Balance (in shares)		472,302
Weighted Average Price
Beginning Balance, Weighted Average Price (in dollars per share)	$ 5.57	$ 6.33
Ending Balance, Weighted Average Price (in dollars per share)	$ 5.29	$ 5.57
Bonus plan \| Phantom Class B Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for units (in years)	4 years
Bonus plan \| Phantom Delayed Exchange Class B Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance (in shares)	472,302
Phantom Delayed Exchange Class B Units Issued (in shares)	0	188,283
Vesting of Phantom Class B Units (in shares)	(201,523)	(208,879)
Phantom Delayed Exchange Class B Units Forfetied (in shares)	0	(10,971)
Ending Balance (in shares)	270,779	472,302
Weighted Average Price
Phantom Delayed Class B Units, Weighted Average Price (in dollars per share)	$ 0	$ 4.67
Vesting of Phantom Class B Units, Weighted Average Price (in dollars per share)	$ 5.97	6.56
Phantom Class B Units Forfeited, Weighted Average Price (in dollars per share)		$ 6.04
Pzena Investment Management, LLC 2006 Equity Incentive Plan \| Phantom Class B Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for units (in years)	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance (in shares)	3,108,154	3,734,050
Phantom Delayed Exchange Class B Units Issued (in shares)
Vesting of Phantom Class B Units (in shares)	(626,158)	(625,896)
Phantom Delayed Exchange Class B Units Forfetied (in shares)
Ending Balance (in shares)	2,481,996	3,108,154
Weighted Average Price
Beginning Balance, Weighted Average Price (in dollars per share)	$ 4.00	$ 4.05
Vesting of Phantom Class B Units, Weighted Average Price (in dollars per share)	4.29	4.29
Ending Balance, Weighted Average Price (in dollars per share)	$ 3.93	4.00
Pzena Investment Management, LLC 2006 Equity Incentive Plan \| Phantom Delayed Exchange Class B Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for units (in years)	10 years
Weighted Average Price
Phantom Delayed Class B Units, Weighted Average Price (in dollars per share)	$ 0	0
Phantom Class B Units Forfeited, Weighted Average Price (in dollars per share)	$ 0	$ 0

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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