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Revenue from Contracts with Customers - Schedule of the Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Operating revenue	$ 3,746,387	$ 2,849,685	$ 2,854,390
Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	3,769,193	2,868,593	2,869,444
Eliminations
Disaggregation of Revenue [Line Items]
Operating revenue	(22,806)	(18,908)	(15,054)
Fixed-price | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	1,973,838	1,684,927	1,403,462
Unit-price | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	189,121	217,563	176,580
Cost reimbursable | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	1,606,234	966,103	1,289,402
Electrical & Mechanical
Disaggregation of Revenue [Line Items]
Operating revenue	2,910,655	2,023,911	2,125,543
Electrical & Mechanical | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	2,920,672	2,031,447	2,134,867
Electrical & Mechanical | Eliminations
Disaggregation of Revenue [Line Items]
Operating revenue	(10,017)	(7,536)	(9,324)
Electrical & Mechanical | Commercial | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	2,074,578	1,197,760	1,204,016
Electrical & Mechanical | Industrial | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	316,581	322,661	473,339
Electrical & Mechanical | Institutional | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	352,671	364,611	262,344
Electrical & Mechanical | Renewables | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	62,635	36,975	55,402
Electrical & Mechanical | Service & other | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	114,207	109,440	139,766
Electrical & Mechanical | Fixed-price | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	1,534,357	1,299,059	1,049,626
Electrical & Mechanical | Unit-price | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	39,010	61,964	81,786
Electrical & Mechanical | Cost reimbursable | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	1,347,305	670,424	1,003,455
Transmission & Distribution
Disaggregation of Revenue [Line Items]
Operating revenue	835,732	825,774	728,847
Transmission & Distribution | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	848,521	837,146	734,577
Transmission & Distribution | Eliminations
Disaggregation of Revenue [Line Items]
Operating revenue	(12,789)	(11,372)	(5,730)
Transmission & Distribution | Utility | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	749,500	753,725	677,434
Transmission & Distribution | Transportation | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	99,021	83,421	57,143
Transmission & Distribution | Fixed-price | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	439,481	385,868	353,836
Transmission & Distribution | Unit-price | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	150,111	155,599	94,794
Transmission & Distribution | Cost reimbursable | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenue	$ 258,929	$ 295,679	$ 285,947

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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