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Segment Information - Summary of segment's internal financial reports (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Contract revenues:	$ 811,616	$ 636,624
Income from operations:	27,426	24,902
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations:	(16,022)	(15,619)
T&D
Segment Reporting Information [Line Items]
Contract revenues:	445,324	364,856
T&D | Operating Segments
Segment Reporting Information [Line Items]
Income from operations:	32,821	30,431
C&I
Segment Reporting Information [Line Items]
Contract revenues:	366,292	271,768
C&I | Operating Segments
Segment Reporting Information [Line Items]
Income from operations:	$ 10,627	$ 10,090

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