Investments in Partnerships - Summary of Equity Investments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Total assets	$ 592,351			$ 558,346
Investments in real estate, at cost:
Operating properties	660,431			654,024
Construction in progress	63,067			41,919
Total investments in real estate	723,498			695,943
Accumulated depreciation	(194,729)			(190,100)
Net investments in real estate	528,769			505,843
Cash and cash equivalents	21,871			15,229
Deferred costs and other assets, net	41,711			37,274
Total assets	592,351			558,346
LIABILITIES AND PARTNERS’ INVESTMENT:
Mortgage loans payable	394,324			383,190
Other liabilities	42,488			34,314
Total liabilities	436,812			417,504
Net investment	155,539			140,842
Partners’ share	81,336			74,663
PREIT’s share	74,203			66,179
Excess investment	7,898	[1]		8,747	[1]
Net investments and advances	82,101			74,926
Investment in partnerships, at equity	147,847			140,882
Distributions in excess of partnership investments	(65,746)			(65,956)
Lehigh Valley Associates, LP [Member]
Schedule of Equity Method Investments [Line Items]
Total assets	51,392			51,703
Equity Method Investment, Summarized Financial Information, Mortgages Payable	130,837			131,394
Equity Method Investment, Summarized Financial Information, Revenue	8,944		9,034
Equity Method Investment, Summarized Financial Information, Property Operating Expenses	(2,480)		(2,764)
Equity Method Investment, Summarized Financial Information, Interest Expense	(1,940)		(1,971)
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	3,461		3,247
Equity Method Investment, Summarized Financial Information, Share of Equity in Income of Partnership	1,730		1,623
Investments in real estate, at cost:
Total assets	$ 51,392			$ 51,703
Lehigh Valley Associates, LP [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%

[1] Excess investment represents the unamortized difference between our investment and our share of the equity in the underlying net investment in the partnerships. The excess investment is amortized over the life of the properties, and the amortization is included in “Equity in income of partnerships.”