Investments in Partnerships - Summary of Share of Equity in Income (Loss) of Partnerships (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity Method Investments And Joint Ventures [Abstract]
Capitalized interest expense	$ 143	$ 836	$ 246	$ 1,927

Interest cost capitalized equity method investments.

No definition available.

Name:	pei_InterestCostCapitalizedEquityMethodInvestments
Namespace Prefix:	pei_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration