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Concentration of Risk and Enterprise Wide Disclosures (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Concentration Risk [Line Items]          
Contract revenues $ 137,061 $ 106,976 $ 304,607 $ 278,485  
Customer concentration risk | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 138,731   $ 138,731   $ 52,788
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 $ 137,061 $ 106,976 $ 304,607 $ 278,485  
Customer concentration risk | Federal Government | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 5,089   $ 5,089   $ 4,607
Concentration risk, percentage     4.00%   9.00%
Customer concentration risk | Federal Government | Contract revenues          
Concentration Risk [Line Items]          
Concentration risk, percentage 8.00% 6.00% 11.00% 9.00%  
Contract revenues $ 10,629 $ 6,246 $ 34,302 $ 24,639  
Customer concentration risk | State Governments | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 2,853   $ 2,853   $ 476
Concentration risk, percentage     2.00%   1.00%
Customer concentration risk | State Governments | Contract revenues          
Concentration Risk [Line Items]          
Concentration risk, percentage 6.00% 14.00% 10.00% 12.00%  
Contract revenues $ 8,351 $ 15,490 $ 30,924 $ 33,282  
Customer concentration risk | Local Governments | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 33,215   $ 33,215   $ 13,927
Concentration risk, percentage     24.00%   26.00%
Customer concentration risk | Local Governments | Contract revenues          
Concentration Risk [Line Items]          
Concentration risk, percentage 32.00% 20.00% 31.00% 20.00%  
Contract revenues $ 43,768 $ 21,413 $ 95,076 $ 55,505  
Customer concentration risk | Private Companies | Trade and contract retainage receivables          
Concentration Risk [Line Items]          
Trade and retainage receivables $ 97,574   $ 97,574   $ 33,778
Concentration risk, percentage     70.00%   64.00%
Customer concentration risk | Private Companies | Contract revenues          
Concentration Risk [Line Items]          
Concentration risk, percentage 54.00% 60.00% 48.00% 59.00%  
Contract revenues $ 74,313 $ 63,827 $ 144,305 $ 165,059