Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Construction	$ 429,269	$ 331,346	$ 656,118	$ 540,833
Large Project Construction	254,463	197,322	461,496	392,771
Construction Materials	79,181	75,911	113,699	110,427
Total revenue	762,913	604,579	1,231,313	1,044,031
Gross profit (loss)	(74,570)	(73,201)	(99,696)	(112,446)
Assets	1,803,145	1,685,829	1,803,145	1,685,829	$ 1,733,453
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit (loss)	(74,570)	(73,201)	(99,696)	(112,446)
Selling, general and administrative expenses	51,388	48,705	113,225	104,838
Gain on sales of property and equipment	(807)	(1,366)	(1,077)	(1,966)
Other income (expense), net	(371)	(1,511)	(465)	(2,112)
Income (loss) before provision for (benefit from) income taxes	24,360	27,373	(11,987)	11,686
Construction [Member]
Segment Reporting Information [Line Items]
Elimination of Intersegment Revenue			0
Construction	429,269	331,346	656,118	540,833
Large Project Construction [Member]
Segment Reporting Information [Line Items]
Large Project Construction	254,463	197,322	461,496	392,771
Construction Materials [Member]
Segment Reporting Information [Line Items]
Construction Materials	79,181	75,911	113,699	110,427
Operating Segments [Member]
Segment Reporting Information [Line Items]
Elimination of Intersegment Revenue				(53,846)
Revenue from reportable segments	806,974	644,010	1,289,478	1,097,877
Construction Materials				1,044,031
Gross profit (loss)	(74,570)	(73,201)	(99,696)	(112,446)
Depreciation, Depletion and Amortization, Nonproduction	13,939	12,723	26,017	24,054
Assets	750,415	756,227	750,415	756,227
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit (loss)	(74,570)	(73,201)	(99,696)	(112,446)
Operating Segments [Member] \| Construction [Member]
Segment Reporting Information [Line Items]
Elimination of Intersegment Revenue				0
Revenue from reportable segments	429,269	331,346	656,118	540,833
Gross profit (loss)	(62,504)	(49,056)	(90,453)	(75,989)
Depreciation, Depletion and Amortization, Nonproduction	5,441	5,345	10,435	9,870
Assets	142,456	151,877	142,456	151,877
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit (loss)	(62,504)	(49,056)	(90,453)	(75,989)
Operating Segments [Member] \| Large Project Construction [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	254,463	197,322	461,496	392,771
Gross profit (loss)	(495)	(13,654)	(3,050)	(27,159)
Depreciation, Depletion and Amortization, Nonproduction	3,081	1,519	4,967	2,988
Assets	312,891	306,440	312,891	306,440
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit (loss)	(495)	(13,654)	(3,050)	(27,159)
Operating Segments [Member] \| Construction Materials [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	123,242	115,342	171,864	164,273
Gross profit (loss)	(11,571)	(10,491)	(6,193)	(9,298)
Depreciation, Depletion and Amortization, Nonproduction	5,417	5,859	10,615	11,196
Assets	295,068	297,910	295,068	297,910
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit (loss)	(11,571)	(10,491)	(6,193)	(9,298)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Elimination of Intersegment Revenue	(44,061)	(39,431)	(58,165)
Intersegment Eliminations [Member] \| Construction [Member]
Segment Reporting Information [Line Items]
Elimination of Intersegment Revenue	0	0
Intersegment Eliminations [Member] \| Large Project Construction [Member]
Segment Reporting Information [Line Items]
Elimination of Intersegment Revenue	0	0	0	0
Intersegment Eliminations [Member] \| Construction Materials [Member]
Segment Reporting Information [Line Items]
Elimination of Intersegment Revenue	$ (44,061)	$ (39,431)	$ (58,165)	$ (53,846)

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