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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property and equipment      
Property and equipment, gross $ 148,455 $ 135,397  
Less-Accumulated depreciation (87,642) (79,638)  
Property and equipment, net 60,813 55,759  
Depreciation expense 15,900 13,700 $ 11,400
Land      
Property and equipment      
Property and equipment, gross 2,745 2,745  
Transportation equipment      
Property and equipment      
Property and equipment, gross $ 64,951 56,229  
Transportation equipment | Minimum      
Property and equipment      
Estimated useful life 1 year    
Transportation equipment | Maximum      
Property and equipment      
Estimated useful life 10 years    
Machinery and equipment      
Property and equipment      
Property and equipment, gross $ 25,118 24,430  
Machinery and equipment | Minimum      
Property and equipment      
Estimated useful life 1 year    
Machinery and equipment | Maximum      
Property and equipment      
Estimated useful life 20 years    
Computer and telephone equipment      
Property and equipment      
Property and equipment, gross $ 21,141 19,812  
Computer and telephone equipment | Minimum      
Property and equipment      
Estimated useful life 1 year    
Computer and telephone equipment | Maximum      
Property and equipment      
Estimated useful life 10 years    
Buildings and leasehold improvements      
Property and equipment      
Property and equipment, gross $ 30,319 27,720  
Buildings and leasehold improvements | Minimum      
Property and equipment      
Estimated useful life 1 year    
Buildings and leasehold improvements | Maximum      
Property and equipment      
Estimated useful life 40 years    
Furniture and fixtures      
Property and equipment      
Property and equipment, gross $ 4,181 $ 4,461  
Furniture and fixtures | Minimum      
Property and equipment      
Estimated useful life 1 year    
Furniture and fixtures | Maximum      
Property and equipment      
Estimated useful life 17 years