Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2022	Aug. 03, 2022
Document Information [Line Items]
Entity Registrant Name	PZENA INVESTMENT MANAGEMENT, INC.
Entity Central Index Key	0001399249
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Shell Company	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Class A common stock, par value $0.01 per share
Document Type	10-Q
Document Period End Date	Jun. 30, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Trading Symbol	PZN
Security Exchange Name	NYSE
Entity File Number	001-33761
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-8999751
Entity Address, Address Line One	320 Park Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10022
City Area Code	212
Local Phone Number	355-1600
Document Quarterly Report	true
Document Transition Report	false
Amendment Flag	false
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		16,736,459
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		56,980,825