Organization (Details)	9 Months Ended
	Sep. 30, 2018
Pzena Investment Management, Pty
Entity Information [Line Items]
Type of Entity (Date of Formation)	Australian Proprietary Limited Company (12/16/2009)
Operating company's ownership	100.00%
Pzena Financial Services, LLC
Entity Information [Line Items]
Type of Entity (Date of Formation)	Delaware Limited Liability Company (10/15/2013)
Operating company's ownership	100.00%
Pzena Investment Management, LTD
Entity Information [Line Items]
Type of Entity (Date of Formation)	England and Wales Private Limited Company (01/08/2015)
Operating company's ownership	100.00%
Pzena U.S. Best Ideas (GP), LLC
Entity Information [Line Items]
Type of Entity (Date of Formation)	Delaware Limited Liability Company (11/16/2017)
Operating company's ownership	100.00%
Pzena Global Best Ideas (GP), LLC
Entity Information [Line Items]
Type of Entity (Date of Formation)	Delaware Limited Liability Company (2/15/2018)
Operating company's ownership	100.00%
Pzena International Small Cap Value Fund, a series of Advisors Series Trust
Entity Information [Line Items]
Type of Entity (Date of Formation)	Open-end Management Investment Company, series of Delaware Statutory Trust (6/28/2018)
Operating company's ownership	100.00%
Pzena Investment Management Special Situations, LLC
Entity Information [Line Items]
Type of Entity (Date of Formation)	Delaware Limited Liability Company (12/01/2010)
Operating company's ownership	99.90%
Pzena International Value Service, a series of Pzena Investment Management International, LLC
Entity Information [Line Items]
Type of Entity (Date of Formation)	Delaware Limited Liability Company (12/22/2003)
Operating company's ownership	53.10%