Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Land and improvements	$ 260,038	$ 234,862
Buildings and improvements	3,556,118	3,509,825
Equipment and software	399,630	379,811
Office furniture and fixtures	34,510	35,651
Construction in progress	28,104	29,831
Property and equipment, gross	4,278,400	4,189,980
Less: Accumulated depreciation	(1,475,951)	(1,352,323)
Property, and Equipment, total	$ 2,802,449	$ 2,837,657