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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2010
Intangible assets      
Intangible assets, net $ 51,978 $ 32,021  
Amortization expense of intangible assets 6,543 9,699 6,580
Number of acquisitions in 2012 4    
Estimated future amortization expense for intangible assets      
2013 7,020    
2014 6,986    
2015 5,834    
2016 5,330    
2017 5,318    
Thereafter 21,490    
Total 51,978 32,021  
Tradename
      
Intangible assets      
Intangible assets, net 23,586 18,791  
Estimated future amortization expense for intangible assets      
Total 23,586 18,791  
Tradename | Minimum
      
Intangible assets      
Amortization Period 3 years    
Tradename | Maximum
      
Intangible assets      
Amortization Period 10 years    
Non-compete agreements
      
Intangible assets      
Intangible assets, net 4,130 4,695  
Estimated future amortization expense for intangible assets      
Total 4,130 4,695  
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 24,212 8,181  
Estimated future amortization expense for intangible assets      
Total 24,212 8,181  
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 50 354  
Estimated future amortization expense for intangible assets      
Total $ 50 $ 354