Revisions in Estimates	3 Months Ended
Mar. 31, 2019
Change In Accounting Estimate [Abstract]
Revisions in Estimates	4. Revisions in Estimates The changes in project profitability from revisions in estimates including estimated cost recovery of customer affirmative claims and back charges, which individually had an impact of $5.0 million or more on gross profit, were decreases of $5.7 million and $5.3 million for one project during each of the three months ended March 31, 2019 and 2018, respectively. The decreases for both periods were in our Transportation segment and were due to additional costs and lower productivity than originally anticipated as well as weather related costs. In our review of the revisions in estimates for the three months ended March 31, 2019 and 2018, we did not identify any material amounts that should have been recorded in a prior period.

Disclosure of the change in an accounting estimate, including a change that occurs in an interim period. If a change in accounting estimate affects several future periods (for example, a change in the service life of a depreciable asset) disclose the effect on income from continuing operations, net income (or other appropriate captions of changes in the applicable net assets or performance indicator), and any related per-share amounts of the current period. Disclosure of the effects of a change in an accounting estimate that occurs in the ordinary course of business (such as uncollectible accounts or inventory obsolescence) is not required, unless the effect is material.

No definition available.

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