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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - Southwest - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
CASH FLOW FROM OPERATING ACTIVITIES:    
Net income $ 180,496 $ 71,587
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 177,449 162,630
Deferred income taxes 62,219 76,117
Gain on sale of property 0 (1,604)
Share-based compensation expense 6,880 7,253
Equity AFUDC (4,482) (2,911)
Changes in current assets and liabilities:    
Accounts receivable, net of allowance 52,022 68,319
Accrued utility revenue 49,800 46,100
Deferred purchased gas costs (18,056) 120,709
Accounts payable (84,060) (68,915)
Accrued taxes (2,319) (21,136)
Other current assets and liabilities (87,009) (44,512)
Changes in deferred charges and other assets (1,360) (25,820)
Changes in other liabilities and deferred credits (23,356) (21,193)
Net cash provided by operating activities 308,224 417,611
CASH FLOW FROM INVESTING ACTIVITIES:    
Capital expenditures and property additions (529,116) (362,457)
Proceeds from the sale of property 0 5,306
Changes in customer advances 7,872 3,953
Other (333) (176)
Net cash used in investing activities (521,577) (396,015)
CASH FLOW FROM FINANCING ACTIVITIES:    
Dividends paid (91,513) (89,139)
Withholding remittance - share-based compensation (5,303) (2,612)
Other, including principal payments on finance leases (175) (4,121)
Net cash used in financing activities (92,774) (30,008)
Change in cash and cash equivalents, including discontinued operations (306,127) (8,162)
SUPPLEMENTAL INFORMATION:    
Interest paid, net of amounts capitalized 87,500 137,866
Income taxes paid, net 507 13,069
Decrease of capital expenditures in Accounts payable or Other current liabilities (26,000) (5,783)
Equity AFUDC capitalized in regulated operations plant 4,482 2,911
Southwest Gas Corporation    
CASH FLOW FROM OPERATING ACTIVITIES:    
Net income 178,528 188,241
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 177,288 162,630
Deferred income taxes 56,785 41,982
Gain on sale of property 0 (1,604)
Share-based compensation expense 6,092 6,578
Equity AFUDC (4,482) (2,911)
Changes in current assets and liabilities:    
Accounts receivable, net of allowance   66,211
Accrued utility revenue 49,800 46,100
Deferred purchased gas costs (18,056) 122,706
Accounts payable (83,842) (71,229)
Accrued taxes (2,319) (9,056)
Other current assets and liabilities (83,780) (44,524)
Changes in deferred charges and other assets (519) (26,378)
Changes in other liabilities and deferred credits (23,895) (19,459)
Net cash provided by operating activities 409,095 459,287
CASH FLOW FROM INVESTING ACTIVITIES:    
Capital expenditures and property additions (529,116) (362,457)
Proceeds from the sale of property 0 5,306
Changes in customer advances 7,872 3,953
Other 69 290
Net cash used in investing activities (521,175) (352,908)
CASH FLOW FROM FINANCING ACTIVITIES:    
Contribution from parent 120,000 0
Dividends paid 0 (89,209)
Withholding remittance - share-based compensation (5,312) (2,613)
Other, including principal payments on finance leases (144) (2,593)
Net cash used in financing activities 114,544 (94,415)
Change in cash and cash equivalents, including discontinued operations 2,464 11,964
Cash and cash equivalents, including discontinued operations, at beginning of period 56,408 311,073
Cash and cash equivalents, including discontinued operations, at end of period 58,872 323,037
SUPPLEMENTAL INFORMATION:    
Interest paid, net of amounts capitalized 87,500 87,245
Income taxes paid, net 0 53
Decrease of capital expenditures in Accounts payable or Other current liabilities (26,000) (4,000)
Equity AFUDC capitalized in regulated operations plant 4,482 2,911
Southwest Gas Corporation | Nonrelated Party    
Changes in current assets and liabilities:    
Accounts receivable, net of allowance 51,945 66,211
Southwest Gas Corporation | Related Party    
Changes in current assets and liabilities:    
Accounts receivable, net of allowance $ 105,550 $ 0