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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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Contract revenues:	$ 828,890	$ 888,616	$ 1,644,452	$ 1,700,232
Income (loss) from operations:	(20,707)	32,438	3,564	59,864
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income (loss) from operations:	(14,015)	(17,919)	(31,003)	(33,940)
T&D
Segment Reporting Information [Line Items]
Contract revenues:	458,209	503,737	948,604	949,060
T&D | Operating Segments
Segment Reporting Information [Line Items]
Income (loss) from operations:	(8,300)	37,734	21,536	70,554
C&I
Segment Reporting Information [Line Items]
Contract revenues:	370,681	384,879	695,848	751,172
C&I | Operating Segments
Segment Reporting Information [Line Items]
Income (loss) from operations:	$ 1,608	$ 12,623	$ 13,031	$ 23,250

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