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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 05, 2014
Vadnais Corporation
Jun. 30, 2014
Contingent Consideration Liability
item
Jun. 30, 2014
Contingent Consideration Liability
Q3C Contracting, Inc
Jun. 30, 2014
Contingent Consideration Liability
Vadnais Corporation
Rollforward of contingent consideration liability level three fair value measurements            
Balance at the beginning of the period       $ 9,233    
Change in fair value of contingent consideration (4,559) (10,161)   441    
Vadnais acquisition     729     729
Payments     (6,354)   (5,000)  
Balance at the end of the period       $ 5,403    
Additional information            
Number of unobservable inputs       2    
Minimum probability of acquired entity meeting contractual operating performance target (as a percent)       33.00%    
Maximum probability of acquired entity meeting contractual operating performance target (as a percent)       100.00%