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Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	(16) Related Party Transactions Raymond R. Oneglia, Vice Chairman of O&G Industries, Inc. (“O&G”), is a director of the Company. The Company occasionally forms construction project joint ventures with O&G. Currently, the Company has a 75% interest in a joint venture with O&G (as the 25% interest holder) to construct the Purple Line Section 2 Extension project in Los Angeles, California. O&G may provide equipment and services to these joint ventures on customary trade terms; there were no material payments made by the joint venture to O&G during the three and nine months ended September 30, 2018 and 2017.