Property and Equipment - Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 3,445,328	$ 3,319,319
Accumulated depreciation	(1,400,885)	(1,321,307)
Property and equipment, net	2,044,443	1,998,012
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	266,427	266,053
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	2,436,294	2,398,117
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	636,362	604,876
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 106,245	$ 50,273