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Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Revenues	$ 463,449	$ 383,458	$ 1,180,431	$ 1,080,184
Operating Income	32,031	28,831	87,506	73,980
Acquisition related costs	0	(401)	0	(1,013)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	463,449	383,458	1,180,431	1,080,184
Operating Income	32,031	29,232	87,506	74,993
Heavy Civil
Segment Reporting Information [Line Items]
Revenues	249,898	201,078	600,105	577,141
Heavy Civil | Operating Segments
Segment Reporting Information [Line Items]
Revenues	249,898	201,078	600,105	577,141
Operating Income	7,174	2,405	12,668	2,679
Specialty Services
Segment Reporting Information [Line Items]
Revenues	148,256	139,971	424,248	380,397
Specialty Services | Operating Segments
Segment Reporting Information [Line Items]
Revenues	148,256	139,971	424,248	380,397
Operating Income	17,932	21,474	57,016	55,834
Residential
Segment Reporting Information [Line Items]
Revenues	65,295	42,409	156,078	122,646
Residential | Operating Segments
Segment Reporting Information [Line Items]
Revenues	65,295	42,409	156,078	122,646
Operating Income	$ 6,925	$ 5,353	$ 17,822	$ 16,480

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