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Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Revenues	$ 315,316	$ 296,688
Operating Income	22,755	12,103
Acquisition related costs	0	(473)
Heavy Civil
Segment Reporting Information [Line Items]
Revenues	147,054	155,615
Specialty Services
Segment Reporting Information [Line Items]
Revenues	124,088	104,723
Residential
Segment Reporting Information [Line Items]
Revenues	44,174	36,350
Operating Segments
Segment Reporting Information [Line Items]
Revenues	315,316	296,688
Operating Income	22,755	12,576
Operating Segments | Heavy Civil
Segment Reporting Information [Line Items]
Revenues	147,054	155,615
Operating Income	1,090	(3,622)
Operating Segments | Specialty Services
Segment Reporting Information [Line Items]
Revenues	124,088	104,723
Operating Income	16,177	11,114
Operating Segments | Residential
Segment Reporting Information [Line Items]
Revenues	44,174	36,350
Operating Income	$ 5,488	$ 5,084

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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