Property and Equipment - Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 3,538,689	$ 3,494,212
Accumulated depreciation	(1,453,502)	(1,428,555)
Property and equipment, net	2,085,187	2,065,657
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	267,427	267,051
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	2,445,053	2,440,471
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	655,045	647,988
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 171,164	$ 138,702