Investments in Partnerships - Summary of Share of Equity in Income of Partnerships (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Total assets	$ 865,964		$ 834,341
Real estate revenue	23,451	$ 26,088
Operating expenses:
Property operating and other expenses	(7,985)	(8,330)
Interest expense	(5,807)	(5,734)
Depreciation and amortization	(4,652)	(5,071)
Total expenses	(18,444)	(19,135)
Net income	5,007	6,953
Partners’ share	(2,687)	(3,824)
PREIT’s share	2,320	3,129
Amortization of and adjustments to excess investment, net	(31)	9
Equity in income of partnerships	2,289	3,138
Lehigh Valley Associates, LP
Schedule of Equity Method Investments [Line Items]
Total assets	52,867		52,255
Mortgage loan payable, net	194,616		$ 196,328
Revenue	8,399	9,132
Property operating expenses	(2,326)	(2,405)
Interest expense	(2,009)	(2,045)
Net income	3,238	4,026
PREIT’s share of equity in income of partnership	$ 1,619	$ 2,013
Lehigh Valley Associates, LP | Lehigh Valley Associates, LP
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%