Investments in Partnerships - Summary of Share of Equity in Income of Partnerships (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Real estate revenue	$ 24,086	$ 23,443	$ 51,286	$ 46,894
Operating expenses:
Property operating and other expenses	(10,731)	(7,543)	(21,960)	(15,527)
Interest expense	(5,610)	(5,843)	(11,970)	(11,651)
Depreciation and amortization	(7,778)	(4,705)	(15,395)	(9,358)
Total expenses	(24,119)	(18,091)	(49,325)	(36,536)
Net income	(33)	5,352	1,961	10,358
Partners’ share	(121)	(2,900)	(1,299)	(5,587)
PREIT’s share	(154)	2,452	662	4,771
Amortization of and adjustments to excess investment, net	(204)	(136)	(201)	(166)
Equity in income of partnerships	(358)	2,316	461	4,605
Total assets	1,062,201		1,062,201		$ 982,924
FDP Term Loan, net	299,438		299,438		299,091
Lehigh Valley Associates, LP
Operating expenses:
Total assets	62,002		62,002		62,504
Mortgage loan payable, net	190,242		190,242		191,998
Revenue	6,971	8,184	14,850	16,583
Property operating expenses	(2,373)	(1,887)	(4,586)	(4,213)
Interest expense	(1,924)	(2,019)	(3,858)	(4,028)
Net income	1,739	3,471	4,661	6,709
PREIT’s share of equity in income of partnership	869	1,736	2,330	3,355
Fashion District Philadelphia
Operating expenses:
Total assets	720,520		720,520		641,377
Revenue	4,937	770	10,513	1,395
Property operating expenses	(3,929)	(501)	(8,055)	(1,199)
Interest expense	(414)		(1,205)
Net income	(3,682)	(1,018)	(7,134)	(2,327)
PREIT’s share of equity in income of partnership	(1,841)	$ (508)	(3,567)	$ (1,163)
FDP Term Loan, net	$ 299,438		$ 299,438		$ 299,091
Lehigh Valley Associates, LP | Lehigh Valley Associates, LP
Operating expenses:
Ownership percentage	50.00%		50.00%
Fashion District Philadelphia | Fashion District Philadelphia
Operating expenses:
Ownership percentage	50.00%		50.00%