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Concentration of Risk and Enterprise Wide Disclosures (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Concentration Risk [Line Items]          
Contract revenues $ 86,091 $ 90,251 $ 167,546 $ 171,509  
Customer concentration risk | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables 62,682   $ 62,682   $ 52,788
Concentration risk, percentage     100.00%   100.00%
Customer concentration risk | Contract revenues          
Concentration Risk [Line Items]          
Contract revenues $ 86,091 $ 90,251 $ 167,546 $ 171,509  
Concentration risk, percentage 100.00% 100.00% 100.00% 100.00%  
Customer concentration risk | Federal Government | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 6,922   $ 6,922   $ 4,607
Concentration risk, percentage     11.00%   9.00%
Customer concentration risk | Federal Government | Contract revenues          
Concentration Risk [Line Items]          
Contract revenues $ 11,083 $ 6,496 $ 23,667 $ 18,393  
Concentration risk, percentage 13.00% 7.00% 14.00% 11.00%  
Customer concentration risk | State Governments | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 389   $ 389   $ 476
Concentration risk, percentage     1.00%   1.00%
Customer concentration risk | State Governments | Contract revenues          
Concentration Risk [Line Items]          
Contract revenues $ 12,942 $ 10,881 $ 22,572 $ 17,791  
Concentration risk, percentage 15.00% 12.00% 13.00% 10.00%  
Customer concentration risk | Local Governments | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 20,052   $ 20,052   $ 13,927
Concentration risk, percentage     32.00%   26.00%
Customer concentration risk | Local Governments | Contract revenues          
Concentration Risk [Line Items]          
Contract revenues $ 30,015 $ 20,586 $ 51,306 $ 34,092  
Concentration risk, percentage 35.00% 23.00% 31.00% 20.00%  
Customer concentration risk | Private Companies | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 35,319   $ 35,319   $ 33,778
Concentration risk, percentage     56.00%   64.00%
Customer concentration risk | Private Companies | Contract revenues          
Concentration Risk [Line Items]          
Contract revenues $ 32,051 $ 52,288 $ 70,001 $ 101,233  
Concentration risk, percentage 37.00% 58.00% 42.00% 59.00%