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Commitments and Contingencies (Details 2) (USD $)	6 Months Ended			0 Months Ended	6 Months Ended
	Jun. 30, 2014	May 31, 2014	Nov. 30, 2011	Feb. 07, 2012 James Construction Group LLC North Texas Tollway Authority v. James Construction Group, LLC wall	Jun. 30, 2014 Q3 Contracting	Mar. 31, 2013 Q3 Contracting	Nov. 30, 2012 Q3 Contracting	Jun. 30, 2014 Letters of credit	Dec. 31, 2013 Letters of credit	Jun. 30, 2014 Bonding	Dec. 31, 2013 Bonding
Commitments and contingencies
Total commercial letters of credit outstanding								$ 7,481,000	$ 7,696,000
Cost to repair retaining wall				5,400,000
Number of other walls constructed on the project, which could have potential exposure to failure				6
Bid and completion bonds issued and outstanding										1,407,201,000	1,458,744,000
Withdrawal liability recorded			7,500,000			119,000	85,000
Withdrawal liability asserted by the Plan		11,700,000
Total of monthly payments towards the liability amount	$ 159,000				$ 23,000

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Represents the number of other walls constructed on the project, which could have potential exposure to failure.

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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.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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

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-Name Accounting Standards Codification

-Topic 450

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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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Amount of the obligation recognized 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.

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