Schedule III Real Estate and Accumulated Depreciation - Reconciliation of Real Estate Accumulated Depreciation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance, beginning of period	$ (3,175,972)	$ (2,595,648)	$ (2,242,345)
Additions (depreciation expense)	(748,942)	(618,970)	(440,002)
Disposals	65,922	9,401	7,396
Foreign currency transaction adjustments and others	(121,206)	29,245	79,303
Balance, end of year	$ (3,980,198)	$ (3,175,972)	$ (2,595,648)