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Business Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Construction $ 209,487 $ 188,520  
Large Project Construction 195,449 190,305  
Construction Materials 34,516 41,424  
Total revenue 439,452 420,249  
Gross profit (loss) 39,245 38,929  
Assets 1,612,230 1,562,343 $ 1,626,878
Reconciliation from Segment Totals to Consolidated [Abstract]      
Gross profit (loss) 39,245 38,929  
Selling, general and administrative expenses 56,133 51,023  
Gain on sales of property and equipment 600 811  
Other income (expense), net (601) 1,833  
Loss before benefit from income taxes (15,687) (13,116)  
Construction [Member]      
Segment Reporting Information [Line Items]      
Construction 209,487 188,520  
Large Project Construction [Member]      
Segment Reporting Information [Line Items]      
Large Project Construction 195,449 190,305  
Construction Materials [Member]      
Segment Reporting Information [Line Items]      
Construction Materials 34,516 41,424  
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from reportable segments 453,867 432,525  
Elimination of intersegment revenue 453,867 432,525  
Gross profit (loss) 39,245 38,929  
Depreciation, Depletion and Amortization, Nonproduction 11,331 12,768  
Assets 734,470 705,088  
Reconciliation from Segment Totals to Consolidated [Abstract]      
Gross profit (loss) 39,245 38,929  
Operating Segments [Member] | Construction [Member]      
Segment Reporting Information [Line Items]      
Revenue from reportable segments 209,487 188,520  
Elimination of intersegment revenue 209,487 188,520  
Gross profit (loss) 26,933 20,595  
Depreciation, Depletion and Amortization, Nonproduction 4,525 4,692  
Assets 141,354 144,878  
Reconciliation from Segment Totals to Consolidated [Abstract]      
Gross profit (loss) 26,933 20,595  
Operating Segments [Member] | Large Project Construction [Member]      
Segment Reporting Information [Line Items]      
Revenue from reportable segments 195,449 190,305  
Elimination of intersegment revenue 195,449 190,305  
Gross profit (loss) 13,505 17,536  
Depreciation, Depletion and Amortization, Nonproduction 1,469 2,644  
Assets 297,489 253,070  
Reconciliation from Segment Totals to Consolidated [Abstract]      
Gross profit (loss) 13,505 17,536  
Operating Segments [Member] | Construction Materials [Member]      
Segment Reporting Information [Line Items]      
Revenue from reportable segments 48,931 53,700  
Elimination of intersegment revenue 48,931 53,700  
Gross profit (loss) (1,193) 798  
Depreciation, Depletion and Amortization, Nonproduction 5,337 5,432  
Assets 295,627 307,140  
Reconciliation from Segment Totals to Consolidated [Abstract]      
Gross profit (loss) (1,193) 798  
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from reportable segments (14,415) (12,276)  
Elimination of intersegment revenue (14,415) (12,276)  
Intersegment Eliminations [Member] | Construction [Member]      
Segment Reporting Information [Line Items]      
Revenue from reportable segments 0 0  
Elimination of intersegment revenue 0 0  
Intersegment Eliminations [Member] | Large Project Construction [Member]      
Segment Reporting Information [Line Items]      
Revenue from reportable segments 0 0  
Elimination of intersegment revenue 0 0  
Intersegment Eliminations [Member] | Construction Materials [Member]      
Segment Reporting Information [Line Items]      
Revenue from reportable segments (14,415) (12,276)  
Elimination of intersegment revenue $ (14,415) $ (12,276)