Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property and Equipment [Line Items]
Land	$ 147,261	$ 172,310
Buildings and leasehold improvements	416,597	467,096
Furniture, fixtures, equipment and purchased software	320,544	296,214
Construction in progress	61,083	7,604
Property and equipment, at cost	945,485	943,224
Less accumulated depreciation and amortization	420,282	406,652
Property and equipment, net	$ 525,203	$ 536,572