Investments in Partnerships - Summary of Equity Investments (Detail) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Total assets		$ 657,389	$ 653,645
Investments in real estate, at cost:
Operating properties		640,707	636,774
Construction in progress		143,538	126,199
Total investments in real estate		784,245	762,973
Accumulated depreciation		(196,458)	(186,580)
Net investments in real estate		587,787	576,393
Cash and cash equivalents		30,651	37,362
Deferred costs and other assets, net(1)		38,951	39,890
Total assets		657,389	653,645
LIABILITIES AND PARTNERS’ INVESTMENT:
Mortgage loans payable(1)		446,512	440,450
Other liabilities		24,957	30,425
Total liabilities		471,469	470,875
Net investment		185,920	182,770
Partners’ share		95,607	95,165
PREIT’s share		90,313	87,605
Excess investment	[1]	7,949	7,877
Net investments and advances		98,262	95,482
Investment in partnerships, at equity		161,450	161,029
Distributions in excess of partnership investments		$ (63,188)	$ (65,547)

[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.”