Organization (Details)	6 Months Ended
	Jun. 30, 2012
Pzena Investment Management, Pty [Member]
Entity Information [Line Items]
Type of Entity (Date of Formation)	Australian Proprietary Limited Company (12/16/2009)
Operating Company's Ownership at end of period (in hundredths)	100.00%
Pzena Investment Management Special Situations, LLC [Member]
Entity Information [Line Items]
Type of Entity (Date of Formation)	Delaware Limited Liability Company (12/01/2010)
Operating Company's Ownership at end of period (in hundredths)	99.90%
Pzena Large Cap Value Fund [Member]
Entity Information [Line Items]
Type of Entity (Date of Formation)	Massachusetts Trust (11/01/2002)
Operating Company's Ownership at end of period (in hundredths)	0.00%
Pzena International Value Service [Member]
Entity Information [Line Items]
Type of Entity (Date of Formation)	Delaware Limited Liability Company (12/22/2003)
Operating Company's Ownership at end of period (in hundredths)	0.00%