Organization (Details)	Mar. 31, 2018
Pzena Investment Management, Pty
Entity Information [Line Items]
Operating company's ownership	100.00%
Pzena Financial Services, LLC
Entity Information [Line Items]
Operating company's ownership	100.00%
Pzena Investment Management, LTD
Entity Information [Line Items]
Operating company's ownership	100.00%
Pzena U.S. Best Ideas (GP), LLC
Entity Information [Line Items]
Operating company's ownership	100.00%
Pzena Investment Management Special Situations, LLC
Entity Information [Line Items]
Operating company's ownership	99.90%
Pzena International Value Service, a series of Pzena Investment Management International, LLC
Entity Information [Line Items]
Operating company's ownership	50.90%