Debt - Long-Term Debt Maturities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
2017	$ 491
2018	294,072
2019	611,372
2020 (2)	1,834,714
2021	1,736,338
2022	1,387,909
2023	1,926,485
2024	974,457
2025	884,378
2026	711,119
Thereafter	764,138
Subtotal	11,125,473
Premiums (discounts), net	5,743
Debt issuance costs, net	(49,294)
Totals	11,081,922	$ 10,608,294
Senior Notes [Member]
Debt Instrument [Line Items]
2017	0
2018	175,000
2019	0
2020 (2)	887,241
2021	1,298,840
2022	798,840
2023	850,000
2024	798,840
2025	750,000
2026	570,600
Thereafter	648,903
Subtotal	6,778,264
Premiums (discounts), net	(22,648)
Debt issuance costs, net	(28,166)
Totals	6,727,450	6,417,492
Term Loans And Other Debt [Member]
Debt Instrument [Line Items]
2017	491
2018	1,009
2019	1,091
2020 (2)	501,155
2021	954
2022	447,396
2023	913,201
2024	882
2025	958
2026	599
Thereafter	112,851
Subtotal	1,980,587
Premiums (discounts), net	0
Debt issuance costs, net	(12,150)
Totals	1,968,437	$ 1,499,001
Secured Mortgage Debt [Member]
Debt Instrument [Line Items]
2017	0
2018	118,063
2019	610,281
2020 (2)	446,318
2021	436,544
2022	141,673
2023	163,284
2024	174,735
2025	133,420
2026	139,920
Thereafter	2,384
Subtotal	2,366,622
Premiums (discounts), net	28,391
Debt issuance costs, net	(8,978)
Totals	$ 2,386,035