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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property and Equipment      
Property and equipment, gross $ 258,610 $ 216,953  
Less: Accumulated depreciation and amortization (115,679) (88,042)  
Property and equipment, net 142,931 128,911  
Depreciation and amortization expense 28,860 24,821 19,176
Land
     
Property and Equipment      
Property and equipment, gross 4,360 3,990  
Buildings and improvements
     
Property and Equipment      
Property and equipment, gross 16,082 13,096  
Buildings and improvements | Minimum
     
Property and Equipment      
Estimated Useful Life 3 years    
Buildings and improvements | Maximum
     
Property and Equipment      
Estimated Useful Life 39 years    
Construction equipment
     
Property and Equipment      
Property and equipment, gross 233,051 195,085  
Construction equipment | Minimum
     
Property and Equipment      
Estimated Useful Life 2 years    
Construction equipment | Maximum
     
Property and Equipment      
Estimated Useful Life 12 years    
Office equipment
     
Property and Equipment      
Property and equipment, gross $ 5,117 $ 4,782  
Office equipment | Minimum
     
Property and Equipment      
Estimated Useful Life 3 years    
Office equipment | Maximum
     
Property and Equipment      
Estimated Useful Life 8 years