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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - Southwest - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Net income $ 42,122 $ (37,600) $ 180,496 $ 71,587
Defined benefit pension plans:        
Amortization of prior service cost, net of tax of $11, $11, $22 and $22, respectively 33 33 66 66
Amortization of net actuarial loss, net of tax of $606, $226, $1,212 and $452, respectively 1,920 717 3,840 1,435
Regulatory adjustment, net of tax of $7,015, ($152), $6,540 and ($304), respectively 22,216 (483) 20,709 (966)
Net defined benefit pension plans, net of tax 24,169 267 24,615 535
Total other comprehensive income, net of tax 24,169 6,978 24,615 7,350
Comprehensive income (loss) 66,291 (30,622) 205,111 78,937
Southwest Gas Corporation        
Net income 40,757 45,646 178,528 188,241
Defined benefit pension plans:        
Amortization of prior service cost, net of tax of $11, $11, $22 and $22, respectively 33 33 66 66
Amortization of net actuarial loss, net of tax of $606, $226, $1,212 and $452, respectively 1,920 717 3,840 1,435
Regulatory adjustment, net of tax of $7,015, ($152), $6,540 and ($304), respectively 22,216 (483) 20,709 (966)
Net defined benefit pension plans, net of tax 24,169 267 24,615 535
Total other comprehensive income, net of tax 24,169 267 24,615 535
Comprehensive income (loss) $ 64,926 $ 45,913 $ 203,143 $ 188,776