Investments in Partnerships - Summary of Share of Equity in Income of Partnerships (Detail) - USD ($) $ in Thousands, number in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Real Estate Revenue Net Equity Method Investments	$ 24,356	$ 20,331	$ 50,853	$ 41,507
Total assets	628,560		628,560		$ 558,346
Operating expenses:
Property operating expenses	(9,290)	(5,749)	(20,052)	(12,849)
Interest expense	(5,146)	(5,452)	(10,441)	(10,927)
Depreciation and amortization	(5,932)	(3,413)	(12,303)	(7,062)
Total expenses	(20,368)	(14,614)	(42,796)	(30,838)
Net income	3,988	5,717	8,057	10,669
Less: Partners’ share	(1,981)	(2,858)	(4,017)	(5,331)
PREIT’s share	2,007	2,859	4,040	5,338
Amortization of excess investment	25	(75)	74	(152)
Equity in income of partnerships	2,032	2,784	4,114	5,186
Lehigh Valley Associates, LP [Member]
Schedule of Equity Method Investments [Line Items]
Total assets	52,161		52,161		51,703
Equity Method Investment, Summarized Financial Information, Mortgages Payable	130,272		130,272		$ 131,394
Equity Method Investment, Summarized Financial Information, Revenue	8,960	9,061	17,904	18,096
Equity Method Investment, Summarized Financial Information, Property Operating Expenses	(2,537)	(2,455)	(5,017)	(5,219)
Equity Method Investment, Summarized Financial Information, Interest Expense	(1,931)	(1,964)	(3,871)	(3,935)
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	3,858	3,836	7,319	7,082
Equity Method Investment, Summarized Financial Information, Share of Equity in Income of Partnership	$ 1,929	$ 1,918	$ 3,659	$ 3,541
Springfield Park [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	0.00%		0.00%