Investments in and Advances to Joint Ventures - Condensed Combined Statements of Operations of Unconsolidated Joint Venture Investments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Expenses from operations:
Operating expenses	$ 124,191	$ 177,576	$ 480,264	$ 595,847
Impairment charges	19,890	10,284	68,394	60,353
Depreciation and amortization	49,629	85,210	196,515	266,370
Interest expense	26,962	46,296	115,915	147,031
Other (income) expense, net	1,454	64,340	99,316	65,298
(Loss) income from continuing operations	(8,816)	(43,060)	(104,865)	(149,936)
Gain on disposition of real estate, net	124	44,291	39,643	127,017
Company's share of equity in net (loss) income of joint ventures	(7,669)	3,819	4,310	(2,570)
Basis differential adjustments(B)	4,749	992	5,377	4,999
Equity in net (loss) income of joint ventures	(2,920)	4,811	9,687	2,429
Unconsolidated Joint Ventures [Member]
Condensed Combined Statements of Operations
Revenues from operations	103,217	126,992	325,501	380,568
Expenses from operations:
Operating expenses	29,577	36,041	96,272	110,400
Impairment charges	87,880	2,160	104,790	82,667
Depreciation and amortization	34,332	45,291	111,308	137,976
Interest expense	23,126	24,276	72,315	83,410
Preferred share expense	6,249	8,307	19,074	24,674
Other (income) expense, net	5,460	6,577	19,497	22,204
Total expenses	186,624	122,652	423,256	461,331
(Loss) income from continuing operations	(83,407)	4,340	(97,755)	(80,763)
Gain on disposition of real estate, net	32,548	31,740	82,924	30,764
Net (loss) income attributable to unconsolidated joint ventures	$ (50,859)	$ 36,080	$ (14,831)	$ (49,999)