UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
REVENUE	$ 22,371	$ 19,388	$ 44,159	$ 38,538
EXPENSES
Compensation and Benefits Expense	8,260	7,263	16,648	14,651
General and Administrative Expense	2,056	2,169	4,003	4,090
TOTAL OPERATING EXPENSES	10,316	9,432	20,651	18,741
Operating Income	12,055	9,956	23,508	19,797
OTHER INCOME/(EXPENSE)
Interest Income	44	46	72	86
Dividend Income	60	66	71	99
Interest Expense	0	(77)	0	(232)
Net Realized and Unrealized Gain/(Loss) from Investments	186	(871)	441	(407)
Change in Liability to Selling and Converting Shareholders	(2,140)	1,118	(2,257)	92
Other Income/(Expense)	(121)	90	(171)	69
Total Other Income/(Expense)	(1,971)	372	(1,844)	(293)
Income Before Income Taxes	10,084	10,328	21,664	19,504
Income Tax Expense/(Benefit)	(516)	2,547	67	2,448
Net Income	10,600	7,781	21,597	17,056
Less: Net Income Attributable to Non-Controlling Interests	9,741	7,308	19,081	15,599
Net Income Attributable to Pzena Investment Management, Inc.	859	473	2,516	1,457
Net Income for Basic Earnings per Share	859	473	2,516	1,457
Basic Earnings per Share (in dollars per share)	$ 0.09	$ 0.05	$ 0.26	$ 0.16
Basic Weighted Average Shares Outstanding (in shares)	9,904,187	9,367,659	9,646,298	9,002,379
Net Income for Diluted Earnings per Share	$ 859	$ 473	$ 13,390	$ 10,464
Diluted Earnings per Share (in dollars per share)	$ 0.09	$ 0.05	$ 0.21	$ 0.16
Diluted Weighted Average Shares Outstanding (in shares)	9,904,187	9,367,659	65,070,712	65,012,960
Cash Dividends per Share of Class A Common Stock (in dollars per share)	$ 0.03	$ 0.03	$ 0.06	$ 0.03