Basis of Presentation (Policies)	9 Months Ended
Basis of Presentation (Policies)	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revision in Estimates	Our profit recognition related to construction contracts is based on estimates of costs to complete each project. These estimates can vary significantly in the normal course of business as projects progress, circumstances develop and evolve, and uncertainties are resolved. We recognize revenue associated with unapproved change orders and, effective in the first quarter of 2015, affirmative claims against customers to the extent the related costs have been incurred, the amount can be reliably estimated and recovery is probable. Prior to 2015, we recognized revenue on affirmative claims against customers when we had a signed agreement. See Note 1 for further discussion. We recognize revisions to estimated total costs as soon as the obligation to perform is determined. When we experience significant changes in our estimates of costs to complete, we undertake a process that includes reviewing the nature of the changes to ensure that there are no material amounts that should have been recorded in a prior period rather than as a revision in estimates for the current period. In our review of these changes for the three and nine months ended September 30, 2015 and 2014, we did not identify any amounts that should have been recorded in a prior period. We use the cumulative catch-up method applicable to construction contract accounting to account for revisions in estimates. Under this method, revisions in estimates are accounted for in their entirety in the period of change. There can be no assurance that we will not experience future changes in circumstances or otherwise be required to revise our profitability estimates. Revenue in an amount equal to cost incurred is recognized if there is not sufficient information to determine the estimated profit on the project with a reasonable level of certainty. The gross profit impact from projects that reached initial profit recognition is not considered to be a change in estimate for purposes of the tables below and is therefore excluded.
Construction Joint Ventures	Generally, each construction joint venture is formed to complete a specific contract and is jointly controlled by the venture members. The associated agreements typically provide that our interests in any profits and assets, and our respective share in any losses and liabilities resulting from the performance of the contracts, are limited to our stated percentage interest in the venture. Under our contractual arrangements, we provide capital to these joint ventures in return for an ownership interest. In addition, members dedicate resources to the ventures necessary to complete the contracts and are reimbursed for their cost. The operational risks of each construction joint venture are passed along to the joint venture members. As we absorb our share of these risks, our investment in each venture is exposed to potential gains and losses. We have determined that certain of these joint ventures are consolidated because they are variable interest entities (“VIEs”), and we are the primary beneficiary. We continually evaluate whether there are changes in the status of the VIEs or changes to the primary beneficiary designation of the VIE.

Disclosure of accounting policy for consolidation to describe the significant judgments and assumptions made in determining whether a variable interest held by the entity requires the variable interest entity to be consolidated and (or) disclose information about its involvement with the variable interest entity; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; and the significant factors considered and judgments made in determining that the power to direct the activities that significantly impact the economic performance of the variable interest entity are shared (as defined).