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Segment Information - Summary of segment's internal financial reports (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Contract revenues:	$ 708,114	$ 649,573	$ 1,344,738	$ 1,242,059
Income from operations:	26,245	29,665	51,147	57,076
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations:	(16,077)	(17,622)	(31,695)	(33,157)
T&D
Segment Reporting Information [Line Items]
Contract revenues:	415,235	326,831	780,091	641,739
T&D | Operating Segments
Segment Reporting Information [Line Items]
Income from operations:	32,810	32,764	63,240	61,437
C&I
Segment Reporting Information [Line Items]
Contract revenues:	292,879	322,742	564,647	600,320
C&I | Operating Segments
Segment Reporting Information [Line Items]
Income from operations:	$ 9,512	$ 14,523	$ 19,602	$ 28,796

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