Revenue from Contracts with Customers - Schedule of the Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Operating revenues	$ 986,820	$ 760,985	$ 2,734,915	$ 2,090,047
Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	990,724	765,399	2,749,950	2,105,555
Eliminations
Disaggregation of Revenue [Line Items]
Operating revenues	(3,904)	(4,414)	(15,035)	(15,508)
Fixed-price | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	515,230	433,908	1,452,588	1,248,617
Cost reimbursable | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	426,792	269,612	1,165,444	689,668
Unit-price | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	48,702	61,879	131,918	167,270
E&M
Disaggregation of Revenue [Line Items]
Operating revenues	765,540	534,741	2,121,145	1,476,151
E&M | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	767,312	536,895	2,129,139	1,481,778
E&M | Eliminations
Disaggregation of Revenue [Line Items]
Operating revenues	(1,772)	(2,154)	(7,994)	(5,627)
E&M | Commercial | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	553,077	327,403	1,480,106	860,088
E&M | Institutional | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	90,951	93,390	286,612	274,916
E&M | Industrial | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	70,114	76,493	233,802	236,349
E&M | Service & other | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	33,699	29,195	85,796	82,874
E&M | Renewables | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	19,471	10,414	42,823	27,551
E&M | Fixed-price | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	396,402	326,972	1,126,383	966,035
E&M | Cost reimbursable | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	362,826	194,892	972,574	466,489
E&M | Unit-price | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	8,084	15,031	30,182	49,254
T&D
Disaggregation of Revenue [Line Items]
Operating revenues	221,280	226,244	613,770	613,896
T&D | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	223,412	228,504	620,811	623,777
T&D | Eliminations
Disaggregation of Revenue [Line Items]
Operating revenues	(2,132)	(2,260)	(7,041)	(9,881)
T&D | Utility | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	196,471	206,669	545,971	559,922
T&D | Transportation | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	26,941	21,835	74,840	63,855
T&D | Fixed-price | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	118,828	106,936	326,205	282,582
T&D | Cost reimbursable | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	63,966	74,720	192,870	223,179
T&D | Unit-price | Operating segments
Disaggregation of Revenue [Line Items]
Operating revenues	$ 40,618	$ 46,848	$ 101,736	$ 118,016