Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting [Abstract]
Contract Amount, Threshold to Determine Segment			$ 75,000
Segment Reporting Information [Line Items]
Construction	$ 427,018	$ 447,097	921,143	$ 873,357
Total revenue	751,376	719,764	1,740,867	1,685,481
Construction Materials	107,274	93,221	229,442	201,014
Large Project Construction	217,084	179,446	590,282	611,110
Gross profit	100,898	66,692	206,775	170,515
Assets	1,718,706	1,683,043	1,718,706	1,683,043	$ 1,620,494
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	100,898	66,692	206,775	170,515
Selling, general and administrative expenses	50,077	47,386	151,374	147,731
Gain on sales of property and equipment	804	3,004	2,090	6,891
Other income (expense), net	1,766	2,124	6,234	6,323
Loss before benefit from income taxes	49,859	20,186	$ 51,257	23,352
Construction [Member]
Segment Reporting Information [Line Items]
Construction Project, Term, Maximum			2 years
Construction	427,018	447,097	$ 921,143	873,357
Large Project Construction [Member]
Segment Reporting Information [Line Items]
Large Project Construction	217,084	179,446	590,282	611,110
Construction Materials [Member]
Segment Reporting Information [Line Items]
Construction Materials	107,274	93,221	229,442	201,014
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	809,873	773,332	1,844,345	1,771,165
Elimination of intersegment revenue	809,873	773,332	1,844,345	1,771,165
Gross profit	100,898	66,692	206,775	170,515
Depreciation, Depletion and Amortization, Nonproduction	14,301	14,806	39,869	41,133
Assets	713,110	720,268	713,110	720,268
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	100,898	66,692	206,775	170,515
Operating Segments [Member] \| Construction [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	427,018	447,097	921,143	873,357
Elimination of intersegment revenue	427,018	447,097	921,143	873,357
Gross profit	64,298	48,802	126,035	82,773
Depreciation, Depletion and Amortization, Nonproduction	5,194	4,621	14,752	12,865
Assets	140,493	150,070	140,493	150,070
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	64,298	48,802	126,035	82,773
Operating Segments [Member] \| Large Project Construction [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	217,084	179,446	590,282	611,110
Elimination of intersegment revenue	217,084	179,446	590,282	611,110
Gross profit	22,572	5,679	55,116	72,264
Depreciation, Depletion and Amortization, Nonproduction	3,308	4,777	8,311	12,001
Assets	271,878	247,694	271,878	247,694
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	22,572	5,679	55,116	72,264
Operating Segments [Member] \| Construction Materials [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	165,771	146,789	332,920	286,698
Elimination of intersegment revenue	165,771	146,789	332,920	286,698
Gross profit	14,028	12,211	25,624	15,478
Depreciation, Depletion and Amortization, Nonproduction	5,799	5,408	16,806	16,267
Assets	300,739	322,504	300,739	322,504
Reconciliation from Segment Totals to Consolidated [Abstract]
Gross profit	14,028	12,211	25,624	15,478
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from reportable segments	(58,497)	(53,568)	(103,478)	(85,684)
Elimination of intersegment revenue	(58,497)	(53,568)	(103,478)	(85,684)
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	(58,497)	(53,568)	(103,478)	(85,684)
Elimination of intersegment revenue	$ (58,497)	$ (53,568)	$ (103,478)	$ (85,684)

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Contract Amount, Threshold to Determine Segment

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Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product and focuses on large, complex projects which are long-term in nature.

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Total Other Income (Expense)

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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