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Receivables, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Accounts Receivable, Gross, Current $ 373,038       $ 298,426       $ 373,038 $ 298,426  
Affirmative Claim Recovery Estimate 12,300       8,800       12,300 8,800  
Back charges claims 300       6,500       300 6,500  
Accounts Notes Loans and Financing Receivable Gross Current 419,918       341,186       419,918 341,186  
Allowance for Accounts Notes Loans and Financing Receivable Current 573       364       573 364  
Receivables, net 419,345       340,822       419,345 340,822  
Revenue, Net 666,681 $ 803,905 $ 604,579 $ 439,452 630,162 $ 751,376 $ 569,242 $ 420,249 2,514,617 2,371,029 $ 2,275,270
Construction [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Revenue, Net                 1,365,198 1,262,675 1,186,445
Large Project Construction [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Revenue, Net                 888,193 812,720 $ 825,044
Completed and in Progress [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Accounts Receivable, Gross, Current 288,160       206,756       288,160 206,756  
Retentions [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Accounts Notes Loans and Financing Receivable Gross Current 84,878       91,670       84,878 91,670  
Construction Material Sales [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Accounts Notes Loans and Financing Receivable Gross Current 29,357       28,727       29,357 28,727  
Other Business Products and Services [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Accounts Notes Loans and Financing Receivable Gross Current $ 17,523       $ 14,033       $ 17,523 $ 14,033  
New York State Department of Transportation [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage Of Revenue Attributable to Counterparty                 8.80%    
Revenue, Net                 $ 222,400    
New York State Department of Transportation [Member] | Large Project Construction [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage Of Revenue Attributable to Counterparty                 5.50%    
California Department of Transportation [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage Of Revenue Attributable to Counterparty                   8.40% 8.60%
Revenue, Net                   $ 199,000 $ 195,400
California Department of Transportation [Member] | Construction [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage Of Revenue Attributable to Counterparty                 12.70%   15.10%
Revenue, Net                 $ 173,400   $ 178,700
California Department of Transportation [Member] | Large Project Construction [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage Of Revenue Attributable to Counterparty                   24.50% 2.00%
Revenue, Net                 $ 48,700   $ 16,800