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Fair Value Measurements (Details 2)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
Rollforward of contingent consideration liability level three fair value measurements    
Change in fair value of contingent consideration liability $ (4,910) $ (4,559)
Contingent Consideration Liability    
Rollforward of contingent consideration liability level three fair value measurements    
Balance at the beginning of the period 6,922 9,233
Change in fair value of contingent consideration liability 90 441
Reduction due to non-attainment of performance target-Ram-Fab (200)  
Balance at the end of the period $ 1,812 5,403
Additional information    
Number of unobservable inputs | item 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%  
Contingent Consideration Liability | Q3 Contracting    
Rollforward of contingent consideration liability level three fair value measurements    
Payment to Q3C sellers for meeting performance targets $ (5,000) (5,000)
Contingent Consideration Liability | Vadnais Corporation    
Rollforward of contingent consideration liability level three fair value measurements    
Additions to contingent consideration liability   $ 729