Investments in and Advances to Joint Ventures - Condensed Combined Statements of Operations of Unconsolidated Joint Venture Investments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Expenses from operations:
Operating expenses	$ 207,022	$ 188,061	$ 418,271	$ 375,881
Impairment charges	28,096	0	50,069	0
Depreciation and amortization	90,276	97,698	181,160	194,600
Interest expense	48,908	54,012	100,735	111,909
Other (income) expense, net	954	(2,081)	958	(3,854)
(Loss) income from continuing operations	(14,721)	27,647	(106,876)	61,139
Gain on disposition of real estate, net	44,599	13,721	82,726	26,102
Company's share of equity in net (loss) income of joint ventures	(1,090)	817	(6,383)	12,091
Basis differential adjustments	373	300	4,001	3,447
Equity in net (loss) income of joint ventures	(717)	1,117	(2,382)	15,538
Unconsolidated Joint Ventures [Member]
Condensed Combined Statements of Operations
Revenues from operations	126,528	128,890	253,576	256,800
Expenses from operations:
Operating expenses	37,691	36,973	74,359	74,629
Impairment charges	27,850	0	80,507	0
Depreciation and amortization	47,589	49,021	92,685	98,056
Interest expense	29,004	33,319	59,134	66,641
Preferred share expense	8,239	8,305	16,367	16,569
Other (income) expense, net	9,054	6,319	15,627	12,130
Total expenses	159,427	133,937	338,679	268,025
(Loss) income from continuing operations	(32,899)	(5,047)	(85,103)	(11,225)
Gain on disposition of real estate, net	(803)	114	(976)	53,597
Net (loss) income attributable to unconsolidated joint ventures	$ (33,702)	$ (4,933)	$ (86,079)	$ 42,372