Debt - Long-Term Debt Maturities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
2018	$ 108,629
2019 (1)	447,342
2020	1,190,946
2021	831,570
2022	1,279,151
Thereafter	5,631,965
Subtotal	9,489,603
Premiums (discounts), net	(21,697)
Debt issuance costs, net	(40,782)
Total	9,427,124	$ 9,412,631
Credit Facilities [Member]
Debt Instrument [Line Items]
2018	0
2019 (1)	0
2020	11,658
2021	0
2022	0
Thereafter	0
Subtotal	11,658
Premiums (discounts), net	0
Debt issuance costs, net	0
Total	11,658	317,392
Senior Notes [Member]
Debt Instrument [Line Items]
2018	0
2019 (1)	0
2020	1,165,802
2021	816,060
2022	816,060
Thereafter	4,356,824
Subtotal	7,154,746
Premiums (discounts), net	(23,909)
Debt issuance costs, net	(28,456)
Total	7,102,381	6,067,277
Term Loans And Other Debt [Member]
Debt Instrument [Line Items]
2018	492
2019 (1)	1,014
2020	1,077
2021	910
2022	452,455
Thereafter	968,756
Subtotal	1,424,704
Premiums (discounts), net	0
Debt issuance costs, net	(9,043)
Total	1,415,661	2,060,491
Secured Mortgages [Member]
Debt Instrument [Line Items]
2018	108,137
2019 (1)	446,328
2020	12,409
2021	14,600
2022	10,636
Thereafter	306,385
Subtotal	898,495
Premiums (discounts), net	2,212
Debt issuance costs, net	(3,283)
Total	$ 897,424	$ 967,471

Face (par) amount of debt instrument at time of issuance.

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