Investments in and Advances to Joint Ventures - Condensed Combined Statements of Operations of Unconsolidated Joint Venture Investments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Expenses from operations:
Operating expenses	$ 183,513	$ 211,249
Impairment charges	30,444	21,973
Depreciation and amortization	74,424	90,884
Interest expense	44,040	51,827
Other (income) expense, net	61,607	4
Loss from continuing operations	(63,908)	(92,155)
Gain on disposition of real estate, net	10,011	38,127
Company's share of equity in net income (loss) of joint ventures	8,473	(5,293)
Basis differential adjustments(B)	313	3,628
Equity in net income (loss) of joint ventures	8,786	(1,665)
Unconsolidated Joint Ventures [Member]
Condensed Combined Statements of Operations
Revenues from operations	114,525	127,048
Expenses from operations:
Operating expenses	34,381	36,668
Impairment charges	16,910	52,657
Depreciation and amortization	39,677	45,096
Interest expense	24,243	30,130
Preferred share expense	6,508	8,128
Other (income) expense, net	7,421	6,573
Total expenses	129,140	179,252
Loss from continuing operations	(14,615)	(52,204)
Gain on disposition of real estate, net	38,020	(173)
Net income (loss) attributable to unconsolidated joint ventures	$ 23,405	$ (52,377)