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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Intangible assets      
Intangible assets, net $ 45,303 $ 51,978  
Amortization expense of intangible assets 7,467 6,543 9,699
Estimated future amortization expense for intangible assets      
2014 7,454    
2015 6,404    
2016 6,029    
2017 5,909    
2018 5,016    
Thereafter 14,491    
Total 45,303 51,978  
Tradename
     
Intangible assets      
Intangible assets, net 21,023 23,586  
Estimated future amortization expense for intangible assets      
Total 21,023 23,586  
Tradename | Minimum
     
Intangible assets      
Amortization Period 3 years    
Tradename | Maximum
     
Intangible assets      
Amortization Period 10 years    
Non-compete agreements
     
Intangible assets      
Intangible assets, net 2,575 4,130  
Estimated future amortization expense for intangible assets      
Total 2,575 4,130  
Non-compete agreements | Minimum
     
Intangible assets      
Amortization Period 2 years    
Non-compete agreements | Maximum
     
Intangible assets      
Amortization Period 5 years    
Customer relationship
     
Intangible assets      
Intangible assets, net 21,705 24,212  
Estimated future amortization expense for intangible assets      
Total 21,705 24,212  
Customer relationship | Minimum
     
Intangible assets      
Amortization Period 5 years    
Customer relationship | Maximum
     
Intangible assets      
Amortization Period 15 years    
Backlog
     
Intangible assets      
Amortization Period 9 months    
Intangible assets, net   50  
Estimated future amortization expense for intangible assets      
Total   $ 50