Debt - Long-Term Debt Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
2017	$ 622,346
2018	781,275
2019	1,065,738
2020	1,260,986
2021	1,380,431
2022	1,328,928
2023	1,899,540
2024	872,089
2025	885,703
2026	528,969
Thereafter	6,529
Subtotal	10,632,534
Premiums (discounts), net	23,713
Debt issuance costs, net	(47,953)
Totals	10,608,294	$ 11,626,831
Credit Facilities [Member]
Debt Instrument [Line Items]
2017	0
2018	35,023
2019	0
2020	0
2021	0
2022	0
2023	0
2024	0
2025	0
2026	0
Thereafter	0
Subtotal	35,023
Premiums (discounts), net	0
Debt issuance costs, net	0
Totals	35,023	0
Senior Notes [Member]
Debt Instrument [Line Items]
2017	0
2018	175,000
2019	618,294
2020	831,071
2021	1,237,871
2022	737,870
2023	850,000
2024	737,870
2025	750,000
2026	527,050
Thereafter	0
Subtotal	6,465,026
Premiums (discounts), net	(19,573)
Debt issuance costs, net	(27,961)
Totals	6,417,492	6,516,392
Term Loans And Other Debt [Member]
Debt Instrument [Line Items]
2017	194,150
2018	961
2019	1,084
2020	1,190
2021	1,012
2022	427,886
2023	874,916
2024	911
2025	976
2026	696
Thereafter	5,368
Subtotal	1,509,150
Premiums (discounts), net	0
Debt issuance costs, net	(10,149)
Totals	1,499,001	$ 2,115,457
Secured Mortgage Debt [Member]
Debt Instrument [Line Items]
2017	428,196
2018	570,291
2019	446,360
2020	428,725
2021	141,548
2022	163,172
2023	174,624
2024	133,308
2025	134,727
2026	1,223
Thereafter	1,161
Subtotal	2,623,335
Premiums (discounts), net	43,286
Debt issuance costs, net	(9,843)
Totals	$ 2,656,778