Investments in Partnerships - Summary of Share of Equity in Income of Partnerships (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Real Estate Revenue Net Equity Method Investments	$ 25,432	$ 25,684	$ 76,285	$ 67,191
Total assets	642,667		642,667		$ 558,346
Operating expenses:
Property operating expenses	(8,768)	(8,659)	(28,819)	(21,508)
Interest expense	(5,211)	(5,483)	(15,653)	(16,410)
Depreciation and amortization	(6,508)	(4,972)	(18,806)	(12,035)
Total expenses	(20,487)	(19,114)	(63,278)	(49,953)
Net income	4,945	6,570	13,007	17,238
Less: Partners’ share	(2,647)	(3,283)	(6,667)	(8,614)
PREIT’s share	2,298	3,287	6,340	8,624
Amortization of excess investment	87	(81)	159	(232)
Equity in income of partnerships	2,385	3,206	6,499	8,392
Lehigh Valley Associates, LP [Member]
Schedule of Equity Method Investments [Line Items]
Total assets	52,668		52,668		51,703
Equity Method Investment, Summarized Financial Information, Mortgages Payable	129,698		129,698		$ 131,394
Equity Method Investment, Summarized Financial Information, Revenue	8,903	9,037	26,807	27,133
Equity Method Investment, Summarized Financial Information, Property Operating Expenses	(2,200)	(2,297)	(7,219)	(7,516)
Equity Method Investment, Summarized Financial Information, Interest Expense	(1,923)	(1,956)	(5,794)	(5,891)
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	3,964	3,984	11,284	11,066
Equity Method Investment, Summarized Financial Information, Share of Equity in Income of Partnership	$ 1,982	$ 1,992	$ 5,642	$ 5,533
Springfield Park [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%