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Debt - Estimated Maturities of Long-Term Debt (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]  
2023 $ 44,558
2024 42,552
2025 91,004
2026 197,056
2027 351,242
Total 726,412
Secured Debt | Centuri secured revolving credit facility  
Debt Instrument [Line Items]  
2023 0
2024 0
2025 0
2026 81,955
2027 0
Total 81,955
Secured Debt | Centuri secured term loan facility  
Debt Instrument [Line Items]  
2023 14,313
2024 11,450
2025 11,450
2026 11,450
2027 11,450
Total 60,113
Other debt obligations  
Debt Instrument [Line Items]  
2023 30,245
2024 31,102
2025 29,554
2026 28,651
2027 7,292
Total 126,844
Southwest Gas Corporation  
Debt Instrument [Line Items]  
2023 0
2024 0
2025 50,000
2026 75,000
2027 332,500
Total 457,500
Southwest Gas Corporation | Debentures  
Debt Instrument [Line Items]  
2023 0
2024 0
2025 0
2026 75,000
2027 332,500
Total 407,500
Southwest Gas Corporation | Revolving credit facility and commercial paper  
Debt Instrument [Line Items]  
2023 0
2024 0
2025 50,000
2026 0
2027 0
Total $ 50,000