Business Segment Information (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Construction	$ 269,220,000	$ 308,602,000	$ 426,261,000	$ 485,720,000
Total revenue	585,870,000	550,348,000	965,717,000	929,052,000
Real Estate	0	4,000	22,000	125,000
Construction Materials	72,322,000	60,185,000	107,771,000	89,936,000
Large Project Construction	244,328,000	181,557,000	431,663,000	353,271,000
Gross profit	82,415,000	49,596,000	103,822,000	79,652,000
Assets	1,653,386,000	1,700,668,000	1,653,386,000	1,700,668,000	1,617,155,000
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	82,415,000	49,596,000	103,822,000	79,652,000
Selling, general and administrative expenses	(51,098,000)	(46,789,000)	(100,346,000)	(103,950,000)
Gain on sales of property and equipment	2,993,000	3,306,000	3,886,000	4,394,000
Other income (expense), net	(1,819,000)	(3,117,000)	(4,197,000)	(5,954,000)
Loss before benefit from income taxes	32,491,000	2,996,000	3,165,000	(25,858,000)
Construction [Member]
Segment Reporting Information [Line Items]
Construction	269,220,000	308,602,000	426,261,000	485,720,000
Large Project Construction [Member]
Segment Reporting Information [Line Items]
Total revenue		181,557,000
Large Project Construction	244,328,000		431,663,000	353,271,000
Construction Materials [Member]
Segment Reporting Information [Line Items]
Total revenue		60,185,000
Construction Materials	72,322,000		107,771,000	89,936,000
Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Real Estate	0	4,000	22,000	125,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	611,348,000	588,035,000	997,833,000	975,378,000
Elimination of intersegment revenue	611,348,000	588,035,000	997,833,000	975,378,000
Gross profit	82,415,000	49,596,000	103,822,000	79,652,000
Depreciation, Depletion and Amortization, Nonproduction	13,761,000	15,478,000	26,328,000	28,678,000
Assets	731,069,000	770,294,000	731,069,000	770,294,000
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	82,415,000	49,596,000	103,822,000	79,652,000
Operating Segments [Member] | Construction [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	269,220,000	308,602,000	426,261,000	485,720,000
Elimination of intersegment revenue	269,220,000	308,602,000	426,261,000	485,720,000
Gross profit	24,827,000	24,070,000	33,972,000	37,269,000
Depreciation, Depletion and Amortization, Nonproduction	4,229,000	6,033,000	8,244,000	11,692,000
Assets	150,113,000	161,524,000	150,113,000	161,524,000
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	24,827,000	24,070,000	33,972,000	37,269,000
Operating Segments [Member] | Large Project Construction [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	244,328,000	181,557,000	431,663,000	353,271,000
Elimination of intersegment revenue	244,328,000	181,557,000	431,663,000	353,271,000
Gross profit	50,792,000	21,571,000	66,583,000	44,292,000
Depreciation, Depletion and Amortization, Nonproduction	4,020,000	3,554,000	7,224,000	5,530,000
Assets	253,646,000	206,778,000	253,646,000	206,778,000
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	50,792,000	21,571,000	66,583,000	44,292,000
Operating Segments [Member] | Construction Materials [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	97,800,000	97,872,000	139,887,000	136,262,000
Elimination of intersegment revenue	97,800,000	97,872,000	139,887,000	136,262,000
Gross profit	6,798,000	3,954,000	3,245,000	(2,021,000)
Depreciation, Depletion and Amortization, Nonproduction	5,512,000	5,891,000	10,860,000	11,456,000
Assets	315,548,000	351,295,000	315,548,000	351,295,000
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	6,798,000	3,954,000	3,245,000	(2,021,000)
Operating Segments [Member] | Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	0	4,000	22,000	125,000
Elimination of intersegment revenue	0	4,000	22,000	125,000
Gross profit	(2,000)	1,000	22,000	112,000
Depreciation, Depletion and Amortization, Nonproduction	0	0	0	0
Assets	11,762,000	50,697,000	11,762,000	50,697,000
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	(2,000)	1,000	22,000	112,000
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	(25,478,000)	(37,687,000)	(32,116,000)	(46,326,000)
Elimination of intersegment revenue	(25,478,000)	(37,687,000)	(32,116,000)	(46,326,000)
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	(25,478,000)	(37,687,000)	(32,116,000)	(46,326,000)
Elimination of intersegment revenue	(25,478,000)	(37,687,000)	(32,116,000)	(46,326,000)
Intersegment Eliminations [Member] | Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	0	0	0	0
Elimination of intersegment revenue	0	0	0	0
Maximum [Member] | Construction [Member]
Segment Reporting Information [Line Items]
Total Contract Value	75,000,000		75,000,000
Minimum [Member] | Large Project Construction [Member]
Segment Reporting Information [Line Items]
Total Contract Value	$ 75,000,000		$ 75,000,000