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Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Revenues	$ 383,458	$ 291,699	$ 1,080,184	$ 779,734
Operating Income	28,831	12,115	73,980	28,019
Acquisition related costs	(401)	(1,896)	(1,013)	(2,158)
Heavy Civil
Segment Reporting Information [Line Items]
Revenues	201,078	218,894	577,141	569,635
Operating Income	2,405	7,420	2,679	11,020
Specialty Services
Segment Reporting Information [Line Items]
Revenues	139,971	32,863	380,397	91,436
Operating Income	21,474	1,371	55,834	3,284
Residential
Segment Reporting Information [Line Items]
Revenues	42,409	39,942	122,646	118,663
Operating Income	5,353	5,220	16,480	15,873
Operating Segments
Segment Reporting Information [Line Items]
Operating Income	$ 29,232	$ 14,011	$ 74,993	$ 30,177

X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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