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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 2018
Subsequent Event [Abstract]
Subsequent Event	(17) Subsequent Event On April 26, 2018, the Company received an unfavorable arbitration decision related to a subcontract back charge dispute on a Civil segment project in New York that was completed in 2013. The decision resulted in an unexpected pre-tax charge of $17.8 million (primarily non-cash) associated with costs for which recovery was previously recorded in accordance with ASC 606 and ASC 605-35, Construction-Type and Production-Type Contracts. The charge was reflected in the results for the three months ended March 31, 2018.