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Segment Information - Summary of Segment's Internal Financial Reports (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Contract revenues	$ 2,498,289	$ 2,247,392	$ 2,071,159
Income from operations	118,560	86,545	57,178
General Corporate
Segment Reporting Information [Line Items]
Income from operations	(68,596)	(60,089)	(46,908)
T&D
Segment Reporting Information [Line Items]
Contract revenues	1,301,587	1,154,378	1,134,411
T&D | Operating Segments
Segment Reporting Information [Line Items]
Income from operations	132,738	109,387	73,580
C&I
Segment Reporting Information [Line Items]
Contract revenues	1,196,702	1,093,014	936,748
C&I | Operating Segments
Segment Reporting Information [Line Items]
Income from operations	$ 54,418	$ 37,247	$ 30,506

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