Investments in Partnerships - Summary of Share of Equity in Income of Partnerships (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Real estate revenue	$ 23,443	$ 23,890	$ 46,894	$ 49,901
Operating expenses:
Property operating and other expenses	(7,543)	(7,524)	(15,527)	(15,705)
Interest expense	(5,843)	(5,834)	(11,651)	(11,568)
Depreciation and amortization	(4,705)	(4,880)	(9,358)	(9,869)
Total expenses	(18,091)	(18,238)	(36,536)	(37,142)
Net income	5,352	5,652	10,358	12,759
Partners’ share	(2,900)	(3,089)	(5,587)	(6,991)
PREIT’s share	2,452	2,563	4,771	5,768
Amortization of and adjustments to excess investment, net	(136)	8	(166)	(59)
Equity in income of partnerships	2,316	2,571	4,605	5,709
Total assets	875,230		875,230		$ 834,341
Lehigh Valley Associates, LP
Operating expenses:
Total assets	53,218		53,218		52,255
Mortgage loan payable, net	193,717		193,717		$ 196,328
Revenue	8,184	8,472	16,583	17,604
Property operating expenses	(1,887)	(2,124)	(4,213)	(4,529)
Interest expense	(2,019)	(2,052)	(4,028)	(4,097)
Net income	3,471	3,616	6,709	7,642
PREIT’s share of equity in income of partnership	$ 1,736	$ 1,808	$ 3,355	$ 3,821
Lehigh Valley Associates, LP | Lehigh Valley Associates, LP
Operating expenses:
Ownership percentage	50.00%		50.00%