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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 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
Other comprehensive income related to discontinued operations 0 6,711 0 6,815
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
Comprehensive income (loss) attributable to noncontrolling interests 0 3,619 0 (1,044)
Comprehensive income (loss) attributable to Southwest Gas Holdings, Inc. $ 66,291 $ (34,241) $ 205,111 $ 79,981