Business Segment Information (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenue from reportable segments	$ 804,689,000	$ 811,050,000	$ 1,779,881,000	$ 1,718,714,000
Elimination of intersegment revenue	(63,114,000)	(82,568,000)	(109,440,000)	(140,457,000)
Revenue from external customers	741,575,000	728,482,000	1,670,441,000	1,578,257,000
Gross profit	54,396,000	101,099,000	135,650,000	177,951,000
Depreciation, Depletion and Amortization, Nonproduction	17,767,000	11,760,000	46,073,000	35,307,000
Assets	1,726,002,000	1,598,635,000	1,726,002,000	1,598,635,000	1,729,487,000
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	54,396,000	101,099,000	135,650,000	177,951,000
Selling, general and administrative expenses	46,586,000	41,280,000	150,698,000	127,801,000
Loss (gain) on restructuring	474,000	0	(23,000)	(2,527,000)
Gain on sales of property and equipment	3,259,000	1,622,000	7,653,000	6,493,000
Other income (expense), net	(2,114,000)	1,418,000	(8,068,000)	(2,184,000)
Income (loss) before benefit from income taxes	8,481,000	62,859,000	(15,440,000)	56,986,000
Construction [Member]
Segment Reporting Information [Line Items]
Typical Contract Value			75,000,000
Revenue from reportable segments	470,567,000	385,744,000	956,287,000	748,803,000
Elimination of intersegment revenue	0	0	0	0
Revenue from external customers	470,567,000	385,744,000	956,287,000	748,803,000
Gross profit	49,635,000	33,273,000	87,987,000	59,814,000
Depreciation, Depletion and Amortization, Nonproduction	8,502,000	3,160,000	20,194,000	9,973,000
Assets	155,440,000	110,402,000	155,440,000	110,402,000
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	49,635,000	33,273,000	87,987,000	59,814,000
Large Project Construction [Member]
Segment Reporting Information [Line Items]
Typical Contract Value			75,000,000
Revenue from reportable segments	187,820,000	255,918,000	540,906,000	648,645,000
Elimination of intersegment revenue	0	0	0	0
Revenue from external customers	187,820,000	255,918,000	540,906,000	648,645,000
Gross profit	(2,543,000)	57,814,000	42,267,000	108,302,000
Depreciation, Depletion and Amortization, Nonproduction	3,634,000	1,102,000	8,792,000	3,279,000
Assets	211,144,000	109,114,000	211,144,000	109,114,000
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	(2,543,000)	57,814,000	42,267,000	108,302,000
Construction Materials [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	146,286,000	169,350,000	282,547,000	316,211,000
Elimination of intersegment revenue	(63,114,000)	(82,568,000)	(109,440,000)	(140,457,000)
Revenue from external customers	83,172,000	86,782,000	173,107,000	175,754,000
Gross profit	7,288,000	9,984,000	5,268,000	9,034,000
Depreciation, Depletion and Amortization, Nonproduction	5,631,000	7,498,000	17,087,000	22,055,000
Assets	340,172,000	353,756,000	340,172,000	353,756,000
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	7,288,000	9,984,000	5,268,000	9,034,000
Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	16,000	38,000	141,000	5,055,000
Elimination of intersegment revenue	0	0	0	0
Revenue from external customers	16,000	38,000	141,000	5,055,000
Gross profit	16,000	28,000	128,000	801,000
Depreciation, Depletion and Amortization, Nonproduction	0	0	0	0
Assets	50,250,000	57,964,000	50,250,000	57,964,000
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	16,000	28,000	128,000	801,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Assets	$ 757,006,000	$ 631,236,000	$ 757,006,000	$ 631,236,000