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Stock-Based Compensation	6 Months Ended
Stock-Based Compensation	Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation totaled approximately $3.7 million and $7.1 million for the three and six months ended June 30, 2019, respectively. Stock-based compensation totaled approximately $2.6 million and $4.8 million for the three and six months ended June 30, 2018, respectively. For periods prior to the Separation, Arcosa's Combined Financial Statements reflect compensation expense for stock-based plans associated with the portion of the Former Parent's equity incentive plans in which Arcosa employees participated.