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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Contract revenues:	$ 649,573	$ 513,051	$ 1,242,059	$ 1,031,521
Income from operations:	29,665	19,342	57,076	35,750
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income from operations:	(17,622)	(13,454)	(33,157)	(24,322)
T&D
Segment Reporting Information [Line Items]
Contract revenues:	326,831	276,759	641,739	536,029
T&D | Operating Segments
Segment Reporting Information [Line Items]
Income from operations:	32,764	23,838	61,437	41,802
C&I
Segment Reporting Information [Line Items]
Contract revenues:	322,742	236,292	600,320	495,492
C&I | Operating Segments
Segment Reporting Information [Line Items]
Income from operations:	$ 14,523	$ 8,958	$ 28,796	$ 18,270

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