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Business Segment Information (Details) - Range [Domain] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Construction $ 305,605 $ 269,220 $ 494,125 $ 426,261  
Total revenue 569,242 585,870 989,491 965,717  
Construction Materials 80,744 72,322 122,168 107,793  
Large Project Construction 182,893 244,328 373,198 431,663  
Gross profit 65,768 82,415 105,877 103,822  
Assets 1,619,692 1,653,386 1,619,692 1,653,386 $ 1,620,494
Reconciliation from Segment Totals to Consolidated [Abstract]          
Gross profit 65,768 82,415 105,877 103,822  
Selling, general and administrative expenses 49,094 51,098 101,297 100,346  
Gain on sales of property and equipment 475 2,993 1,286 3,886  
Other income (expense), net 2,635 1,819 4,468 4,197  
Loss before benefit from income taxes 14,514 32,491 1,398 3,165  
Construction [Member]          
Segment Reporting Information [Line Items]          
Construction 305,605 269,220 494,125 426,261  
Large Project Construction [Member]          
Segment Reporting Information [Line Items]          
Large Project Construction 182,893 244,328 373,198 431,663  
Construction Materials [Member]          
Segment Reporting Information [Line Items]          
Construction Materials 80,744 72,322 122,168 107,793  
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue from reportable segments 601,947 611,348 1,034,472 997,833  
Elimination of intersegment revenue 601,947 611,348 1,034,472 997,833  
Gross profit 65,768 82,415 105,877 103,822  
Depreciation, Depletion and Amortization, Nonproduction 12,800 13,761 25,568 26,328  
Assets 716,470 731,069 716,470 731,069  
Reconciliation from Segment Totals to Consolidated [Abstract]          
Gross profit 65,768 82,415 105,877 103,822  
Operating Segments [Member] | Construction [Member]          
Segment Reporting Information [Line Items]          
Revenue from reportable segments 305,605 269,220 494,125 426,261  
Elimination of intersegment revenue 305,605 269,220 494,125 426,261  
Gross profit 40,062 24,827 61,737 33,972  
Depreciation, Depletion and Amortization, Nonproduction 4,866 4,229 9,558 8,244  
Assets 143,139 150,113 143,139 150,113  
Reconciliation from Segment Totals to Consolidated [Abstract]          
Gross profit 40,062 24,827 61,737 33,972  
Operating Segments [Member] | Large Project Construction [Member]          
Segment Reporting Information [Line Items]          
Revenue from reportable segments 182,893 244,328 373,198 431,663  
Elimination of intersegment revenue 182,893 244,328 373,198 431,663  
Gross profit 14,773 50,792 32,544 66,583  
Depreciation, Depletion and Amortization, Nonproduction 2,359 4,020 5,003 7,224  
Assets 265,124 253,646 265,124 253,646  
Reconciliation from Segment Totals to Consolidated [Abstract]          
Gross profit 14,773 50,792 32,544 66,583  
Operating Segments [Member] | Construction Materials [Member]          
Segment Reporting Information [Line Items]          
Revenue from reportable segments 113,449 97,800 167,149 139,909  
Elimination of intersegment revenue 113,449 97,800 167,149 139,909  
Gross profit 10,933 6,796 11,596 3,267  
Depreciation, Depletion and Amortization, Nonproduction 5,575 5,512 11,007 10,860  
Assets 308,207 327,310 308,207 327,310  
Reconciliation from Segment Totals to Consolidated [Abstract]          
Gross profit 10,933 6,796 11,596 3,267  
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenue from reportable segments (32,705) (25,478) (44,981) (32,116)  
Elimination of intersegment revenue (32,705) (25,478) (44,981) (32,116)  
Intersegment Eliminations [Member] | Construction [Member]          
Segment Reporting Information [Line Items]          
Revenue from reportable segments 0 0 0 0  
Elimination of intersegment revenue 0 0 0 0  
Intersegment Eliminations [Member] | Large Project Construction [Member]          
Segment Reporting Information [Line Items]          
Revenue from reportable segments 0 0 0 0  
Elimination of intersegment revenue 0 0 0 0  
Intersegment Eliminations [Member] | Construction Materials [Member]          
Segment Reporting Information [Line Items]          
Revenue from reportable segments (32,705) (25,478) (44,981) (32,116)  
Elimination of intersegment revenue $ (32,705) $ (25,478) $ (44,981) $ (32,116)