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Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 222,765 $ 214,082
Accumulated depreciation and amortization (131,719) (122,884)
Property and equipment, net 91,046 91,198
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 820 820
Buildings and Improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 75,308 74,486
Machinery, Vehicles and Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 79,002 76,117
Furniture and Fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 16,782 15,282
Computer Hardware and Software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 50,853 $ 47,377