Property and Equipment - Summary of Major Classes of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 510,712	$ 496,225
Less accumulated depreciation	(322,319)	(305,928)
Property and Equipment, Net	188,393	190,297
Land, buildings and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	187,405	185,940
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	257,119	240,227
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	52,840	54,615
Motor vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 13,348	$ 15,443