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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Concentration Risk [Line Items]          
Contract revenues $ 140,301 $ 86,091 $ 269,924 $ 167,546  
Customer concentration risk | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 103,593   $ 103,593   $ 93,398
Concentration risk, percentage     100.00%   100.00%
Customer concentration risk | Contract revenues          
Concentration Risk [Line Items]          
Concentration risk, percentage 100.00% 100.00% 100.00% 100.00%  
Contract revenues $ 140,301 $ 86,091 $ 269,924 $ 167,546  
Customer concentration risk | Federal Government | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 2,177   $ 2,177   $ 4,230
Concentration risk, percentage     2.00%   5.00%
Customer concentration risk | Federal Government | Contract revenues          
Concentration Risk [Line Items]          
Concentration risk, percentage 6.00% 13.00% 4.00% 14.00%  
Contract revenues $ 7,776 $ 11,083 $ 11,932 $ 23,667  
Customer concentration risk | State Governments | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 3,439   $ 3,439   $ 1,274
Concentration risk, percentage     3.00%   1.00%
Customer concentration risk | State Governments | Contract revenues          
Concentration Risk [Line Items]          
Concentration risk, percentage 7.00% 15.00% 6.00% 13.00%  
Contract revenues $ 10,462 $ 12,942 $ 15,829 $ 22,572  
Customer concentration risk | Local Governments | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 17,085   $ 17,085   $ 16,650
Concentration risk, percentage     17.00%   18.00%
Customer concentration risk | Local Governments | Contract revenues          
Concentration Risk [Line Items]          
Concentration risk, percentage 16.00% 35.00% 16.00% 31.00%  
Contract revenues $ 22,470 $ 30,015 $ 42,147 $ 51,306  
Customer concentration risk | Private Companies | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 80,892   $ 80,892   $ 71,244
Concentration risk, percentage     78.00%   76.00%
Customer concentration risk | Private Companies | Contract revenues          
Concentration Risk [Line Items]          
Concentration risk, percentage 71.00% 37.00% 74.00% 42.00%  
Contract revenues $ 99,593 $ 32,051 $ 200,016 $ 70,001