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Commitments and Contingencies (Details 2) $ in Thousands		47 Months Ended
	Feb. 25, 2015 USD ($)	Sep. 30, 2015 USD ($) project	Dec. 31, 2014 USD ($)	May. 31, 2014 USD ($)	Dec. 31, 2012 USD ($)	Nov. 30, 2011 USD ($)
Commitments and contingencies
Billings in excess of costs and estimated earnings		$ 144,837	$ 158,595
Withdrawal liability recorded						$ 7,500
Withdrawal total liability asserted by the Plan				$ 11,819
Monthly payments towards the liability amount		$ 1,600
Construction Projects
Commitments and contingencies
Number of projects under litigation | project		2
Billings in excess of costs and estimated earnings		$ 28,000
Construction Project One
Commitments and contingencies
Receivable recorded relating to the project		32,900
Construction Project Two
Commitments and contingencies
Receivable recorded relating to the project		17,900
James Construction Group LLC | North Texas Tollway Authority v. James Construction Group, LLC
Commitments and contingencies
Expected cost on settlement	$ 9,000
Q3 Contracting
Commitments and contingencies
Withdrawal liability recorded					$ 7,585
Letters of credit
Commitments and contingencies
Total commercial letters of credit outstanding		14,107	6,864
Bonding
Commitments and contingencies
Bid and completion bonds issued and outstanding		$ 1,558,465	$ 1,518,018

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Amount of the obligation, asserted by the Plan, by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers

+ References

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Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 605



-SubTopic 35



-Section 45



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Amount of contributions made to the multiemployer plan by all employers who participate in the plan. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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