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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Property and equipment    
Gross property and equipment $ 363,559 $ 289,829
Less: accumulated depreciation and amortization (137,047) (104,989)
Net property and equipment 226,512 184,840
Minimum
   
Property and equipment    
Useful Life 3 years  
Maximum
   
Property and equipment    
Useful Life 30 years  
Land and buildings
   
Property and equipment    
Gross property and equipment 36,883 29,914
Useful Life 30 years  
Leasehold improvements
   
Property and equipment    
Gross property and equipment 7,958 11,974
Office equipment
   
Property and equipment    
Gross property and equipment 3,171 2,092
Office equipment | Minimum
   
Property and equipment    
Useful Life 3 years  
Office equipment | Maximum
   
Property and equipment    
Useful Life 5 years  
Construction equipment
   
Property and equipment    
Gross property and equipment 247,997 197,200
Construction equipment | Minimum
   
Property and equipment    
Useful Life 3 years  
Construction equipment | Maximum
   
Property and equipment    
Useful Life 7 years  
Transportation equipment
   
Property and equipment    
Gross property and equipment $ 67,550 $ 48,649
Transportation equipment | Minimum
   
Property and equipment    
Useful Life 3 years  
Transportation equipment | Maximum
   
Property and equipment    
Useful Life 18 years