Segment Information - Summary of Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Operating revenues	$ 986,820	$ 760,985	$ 2,734,915	$ 2,090,047
Cost of sales	862,598	671,085	2,398,331	1,836,853
Gross profit	124,222	89,900	336,584	253,194
Selling, general and administrative expenses	51,841	36,191	140,712	109,292
Operating income	72,381	53,709	195,872	143,902
Interest income	1,369	0	2,858	0
Interest expense	5,441	2,851	16,437	8,823
Other income, net	3,745	1,071	6,220	3,683
Income before income taxes and income from equity method investments	72,054	51,929	188,513	138,762
Operating segments
Segment Reporting Information [Line Items]
Operating revenues	990,724	765,399	2,749,950	2,105,555
Corporate and Other
Segment Reporting Information [Line Items]
Cost of sales	(166)	(49)	(502)	(146)
Gross profit	166	49	502	146
Selling, general and administrative expenses	12,274	6,541	30,779	17,097
Operating income	(12,108)	(6,492)	(30,277)	(16,951)
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(3,904)	(4,414)	(15,035)	(15,508)
E&M
Segment Reporting Information [Line Items]
Operating revenues	765,540	534,741	2,121,145	1,476,151
E&M | Operating segments
Segment Reporting Information [Line Items]
Operating revenues	767,312	536,895	2,129,139	1,481,778
Cost of sales	679,340	480,149	1,880,567	1,312,538
Gross profit	86,200	54,592	240,578	163,613
Selling, general and administrative expenses	29,224	19,649	80,065	62,842
Operating income	56,976	34,943	160,513	100,771
Interest expense	(2,431)	(54)	(5,728)	117
E&M | Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(1,772)	(2,154)	(7,994)	(5,627)
T&D
Segment Reporting Information [Line Items]
Operating revenues	221,280	226,244	613,770	613,896
T&D | Operating segments
Segment Reporting Information [Line Items]
Operating revenues	223,412	228,504	620,811	623,777
Cost of sales	183,424	190,985	518,266	524,461
Gross profit	37,856	35,259	95,504	89,435
Selling, general and administrative expenses	10,343	10,001	29,868	29,353
Operating income	27,513	25,258	65,636	60,082
Interest expense	946	982	2,644	3,030
T&D | Eliminations
Segment Reporting Information [Line Items]
Operating revenues	$ (2,132)	$ (2,260)	$ (7,041)	$ (9,881)