Investments in Partnerships - Summary of Equity Investments (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Total assets		$ 644,613	$ 653,645
Investments in real estate, at cost:
Operating properties		639,874	636,774
Construction in progress		128,479	126,199
Total investments in real estate		768,353	762,973
Accumulated depreciation		(191,450)	(186,580)
Net investments in real estate		576,903	576,393
Cash and cash equivalents		29,711	37,362
Deferred costs and other assets, net		37,999	39,890
Total assets		644,613	653,645
LIABILITIES AND PARTNERS’ INVESTMENT:
Mortgage loans payable		444,599	440,450
Other liabilities		22,853	30,425
Total liabilities		467,452	470,875
Net investment		177,161	182,770
Partners’ share		91,516	95,165
PREIT’s share		85,645	87,605
Excess investment	[1]	7,638	7,877
Net investments and advances		93,283	95,482
Investment in partnerships, at equity		157,995	161,029
Distributions in excess of partnership investments		$ (64,712)	$ (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.”