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Segment Information - Summary of segment's internal financial reports (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Contract revenues:	$ 939,476	$ 799,848	$ 2,639,708	$ 2,144,586
Income from operations:	32,027	26,975	91,891	78,122
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations:	(18,167)	(18,216)	(52,108)	(49,911)
T&D
Segment Reporting Information [Line Items]
Contract revenues:	548,595	452,014	1,497,655	1,232,105
T&D | Operating Segments
Segment Reporting Information [Line Items]
Income from operations:	36,262	34,315	106,817	97,555
C&I
Segment Reporting Information [Line Items]
Contract revenues:	390,881	347,834	1,142,053	912,481
C&I | Operating Segments
Segment Reporting Information [Line Items]
Income from operations:	$ 13,932	$ 10,876	$ 37,182	$ 30,478

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

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