Investments in Partnerships - Summary of Share of Equity in Income of Partnerships (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Real estate revenue	$ 99,580	$ 98,781	$ 115,118
Expenses:
Property operating and other expenses	(34,955)	(30,839)	(33,273)
Interest expense	(23,272)	(23,373)	(25,251)
Depreciation and amortization	(21,942)	(19,393)	(24,872)
Total expenses	(80,169)	(73,605)	(83,396)
Net income	19,411	25,176	31,722
Less: Partners’ share	(10,768)	(13,719)	(17,607)
PREIT’s share	8,643	11,457	14,115
Amortization of excess investment	(354)	(82)	252
Equity in income of partnerships	8,289	11,375	14,367
Total assets	982,924	834,341
FDP Term Loan, net	299,091	247,901
Lehigh Valley Associates, LP
Expenses:
Total assets	62,504	52,255	43,850
Mortgage payable	191,998	196,328	199,451
Revenue	32,906	35,662	34,945
Property operating expenses	8,448	9,014	9,038
Interest expense	8,055	8,222	10,907
Net income	13,162	15,605	11,389
PREIT’s share of equity in income of partnership	6,581	7,803	5,695
Fashion District Philadelphia
Expenses:
Total assets	641,377	497,419	428,827
Revenue	8,028	4,053	18,708
Property operating expenses	6,995	3,630	6,909
Interest expense	178	126	126
Net income	(7,352)	(4,990)	2,436
PREIT’s share of equity in income of partnership	(3,676)	(2,495)	$ 1,218
FDP Term Loan, net	$ 299,091	$ 250,000
Lehigh Valley Associates, LP | Lehigh Valley Associates, LP
Expenses:
Ownership percentage	50.00%
Fashion District Philadelphia | Fashion District Philadelphia
Expenses:
Ownership percentage	50.00%