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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events On February 3, 2020, the Company acquired PerLectric, Inc., a leading electrical construction company in Fairfax, Virginia, which will be included in the Company's construction services segment. On February 14, 2020, the Company acquired the assets of Oldcastle Infrastructure Spokane, a prestressed-concrete business located in Spokane, Washington, which will be included in the Company's construction materials and contracting segment. To date, the initial accounting for these acquisitions is incomplete. Due to the limited time since the date of these acquisitions, it is impracticable for the Company to make business combination disclosures related to these acquisitions. The Company is still gathering the necessary information to provide such disclosures in future filings.