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Segment Information - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Revenues $ 7,874,787 $ 6,233,334
Segment operating expense (excluding segment depreciation expense) 7,114,288 5,668,852
Segment depreciation expense 108,269 92,380
Segment operating expenses 7,222,557 5,761,232
Equity in earnings of integral unconsolidated affiliates 14,469 12,929
Segment operating income 666,699 485,031
Total consolidated operating income 338,779 239,081
Non-cash stock-based compensation 62,634 38,151
Corporate and Non-Allocated Costs    
Segment Reporting Information [Line Items]    
Corporate and non-allocated costs (327,920) (245,950)
Amortization 152,400 109,600
Non-cash stock-based compensation 62,600 38,200
Electric    
Segment Reporting Information [Line Items]    
Revenues 6,468,657 4,944,391
Segment operating expense (excluding segment depreciation expense) 5,839,272 4,482,845
Segment depreciation expense 82,772 66,311
Segment operating expenses 5,922,044 4,549,156
Equity in earnings of integral unconsolidated affiliates 14,469 12,929
Segment operating income $ 561,082 $ 408,164
Segment operating margin 8.70% 8.30%
Underground and Infrastructure    
Segment Reporting Information [Line Items]    
Revenues $ 1,406,130 $ 1,288,943
Segment operating expense (excluding segment depreciation expense) 1,275,016 1,186,007
Segment depreciation expense 25,497 26,069
Segment operating expenses 1,300,513 1,212,076
Equity in earnings of integral unconsolidated affiliates 0 0
Segment operating income $ 105,617 $ 76,867
Segment operating margin 7.50% 6.00%