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Segment Information - Summarized Financial Information (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]        
Revenues $ 7,631,408 $ 6,493,167 $ 20,637,749 $ 17,119,373
Segment operating expense (excluding segment depreciation expense) 6,720,150 5,753,059 18,439,099 15,381,188
Segment depreciation expense 98,934 84,153 285,345 245,217
Segment operating expenses 6,819,084 5,837,212 18,724,444 15,626,405
Equity in earnings of integral unconsolidated affiliates 13,731 14,015 41,104 34,935
Segment operating income 826,055 669,970 1,954,409 1,527,903
Total consolidated operating income 517,217 431,161 1,126,580 893,745
Non-cash stock-based compensation     129,121 110,815
Corporate and Non-Allocated Costs        
Segment Reporting Information [Line Items]        
Corporate and non-allocated costs (308,838) (238,809) (827,829) (634,158)
Amortization 133,200 110,400 355,900 267,100
Non-cash stock-based compensation 46,900 38,200 129,100 110,800
Electric        
Segment Reporting Information [Line Items]        
Revenues 6,172,019 5,233,887 16,574,484 13,631,891
Segment operating expense (excluding segment depreciation expense) 5,409,552 4,609,149 14,743,565 12,180,287
Segment depreciation expense 72,359 62,739 207,400 181,073
Segment operating expenses 5,481,911 4,671,888 14,950,965 12,361,360
Equity in earnings of integral unconsolidated affiliates 13,731 14,015 41,104 34,935
Segment operating income $ 703,839 $ 576,014 $ 1,664,623 $ 1,305,466
Segment operating margin 11.40% 11.00% 10.00% 9.60%
Underground and Infrastructure        
Segment Reporting Information [Line Items]        
Revenues $ 1,459,389 $ 1,259,280 $ 4,063,265 $ 3,487,482
Segment operating expense (excluding segment depreciation expense) 1,310,598 1,143,910 3,695,534 3,200,901
Segment depreciation expense 26,575 21,414 77,945 64,144
Segment operating expenses 1,337,173 1,165,324 3,773,479 3,265,045
Equity in earnings of integral unconsolidated affiliates 0 0 0 0
Segment operating income $ 122,216 $ 93,956 $ 289,786 $ 222,437
Segment operating margin 8.40% 7.50% 7.10% 6.40%
Loss on disposition of non-core business       $ 11,900