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Segment Information - Summary of segment's internal financial reports (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Contract revenues:	$ 815,562	$ 811,616
Income from operations:	24,271	27,426
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations:	(16,989)	(16,022)
T&D
Segment Reporting Information [Line Items]
Contract revenues:	490,395	445,324
T&D | Operating Segments
Segment Reporting Information [Line Items]
Income from operations:	29,837	32,821
C&I
Segment Reporting Information [Line Items]
Contract revenues:	325,167	366,292
C&I | Operating Segments
Segment Reporting Information [Line Items]
Income from operations:	$ 11,423	$ 10,627

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The net result for the period of deducting operating expenses from operating revenues.

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