Debt - Long-Term Debt Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
2019	$ 273,056
2020	1,720,689
2021	1,001,838
2022	1,087,389
2023	1,652,135
Thereafter	5,426,219
Subtotal	11,161,326
Premiums (discounts), net	(25,228)
Debt issuance costs, net	(46,283)
Total	11,089,815	$ 9,412,631
Credit Facilities [Member]
Debt Instrument [Line Items]
2019	0
2020	50,500
2021	0
2022	0
2023	0
Thereafter	0
Subtotal	50,500
Premiums (discounts), net	0
Debt issuance costs, net	0
Total	50,500	317,392
Senior Notes [Member]
Debt Instrument [Line Items]
2019	0
2020	1,145,000
2021	801,500
2022	801,500
2023	850,000
Thereafter	4,766,808
Subtotal	8,364,808
Premiums (discounts), net	(26,173)
Debt issuance costs, net	(34,488)
Total	8,304,147	6,067,277
Term Loans And Other Debt [Member]
Debt Instrument [Line Items]
2019	868
2020	500,723
2021	778
2022	273,786
2023	762,887
Thereafter	390,616
Subtotal	1,929,658
Premiums (discounts), net	0
Debt issuance costs, net	(8,230)
Total	1,921,428	2,060,491
Secured Mortgages [Member]
Debt Instrument [Line Items]
2019	272,188
2020	24,466
2021	199,560
2022	12,103
2023	39,248
Thereafter	268,795
Subtotal	816,360
Premiums (discounts), net	945
Debt issuance costs, net	(3,565)
Total	$ 813,740	$ 967,471

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

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