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Property and Equipment, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 150,207us-gaap_PropertyPlantAndEquipmentGross $ 135,608us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization (96,727)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (90,190)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 53,480us-gaap_PropertyPlantAndEquipmentNet 45,418us-gaap_PropertyPlantAndEquipmentNet
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 853us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
1,131us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Buildings and Improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 58,915us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
49,942us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Machinery, vehicles and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 68,953us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
64,012us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 21,486us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
$ 20,523us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember