Equity and Noncontrolling Interests (Noncontrolling interests) - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Equity [Abstract]
Noncontrolling interests in the Operating Partnership, net book value	$ 7,028	$ 7,086

Represents the book value of the noncontrolling interests in the Operating Partnership at the period end date.

No definition available.

Name:	pps_NoncontrollingInterestBookValue
Namespace Prefix:	pps_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant