Property and Equipment - Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 3,494,212	$ 3,319,319
Accumulated depreciation	(1,428,555)	(1,321,307)
Property and equipment, net	2,065,657	1,998,012
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	267,051	266,053
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	2,440,471	2,398,117
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	647,988	604,876
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 138,702	$ 50,273