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Summary of Significant Accounting Policies - Goodwill (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Oct. 31, 2015
USD ($)
Rate
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2015
USD ($)
segment
reporting_unit
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Goodwill [Line Items]          
Goodwill   $ 65,982 $ 65,982 $ 33,798 $ 33,798
Number of reporting units | reporting_unit     2    
Number of operating segments | segment   2 2    
Revenue growth rate implied in reporting units valuations, number of years projected     5 years    
Heavy Civil Marine Construction Segment          
Goodwill [Line Items]          
Goodwill   $ 33,798 $ 33,798    
Discount rate | Rate 20.00%        
Percentage of fair value in excess of carrying amount 1.00%        
Commercial Concrete Segment          
Goodwill [Line Items]          
Goodwill   $ 32,200 $ 32,200    
Discount rate 15.75%        
Percentage of fair value in excess of carrying amount 10.00%        
Estimate of Fair Value Measurement | Heavy Civil Marine Construction Segment          
Goodwill [Line Items]          
Goodwill impairment, segment value $ 257,000        
Estimate of Fair Value Measurement | Commercial Concrete Segment          
Goodwill [Line Items]          
Goodwill impairment, segment value 130,000        
Reported Value Measurement | Heavy Civil Marine Construction Segment          
Goodwill [Line Items]          
Goodwill impairment, segment value 255,000        
Reported Value Measurement | Commercial Concrete Segment          
Goodwill [Line Items]          
Goodwill impairment, segment value $ 117,200