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Debt - Estimated Maturities of Long-Term Debt (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]  
2022 $ 297,324
2023 22,497
2024 22,735
2025 150,526
2026 197,269
Long-term debt 690,351
Secured Debt | Centuri secured revolving credit facility  
Debt Instrument [Line Items]  
2022 0
2023 0
2024 0
2025 0
2026 103,329
Long-term debt 103,329
Secured Debt | Centuri secured term loan facility  
Debt Instrument [Line Items]  
2022 11,450
2023 11,450
2024 11,450
2025 11,450
2026 11,450
Long-term debt 57,250
Other debt obligations  
Debt Instrument [Line Items]  
2022 10,874
2023 11,047
2024 11,285
2025 9,076
2026 7,490
Long-term debt 49,772
Southwest Gas Corporation  
Debt Instrument [Line Items]  
2022 275,000
2023 0
2024 0
2025 130,000
2026 75,000
Long-term debt 480,000
Southwest Gas Corporation | Debentures  
Debt Instrument [Line Items]  
2022 275,000
2023 0
2024 0
2025 0
2026 75,000
Long-term debt 350,000
Southwest Gas Corporation | Revolving credit facility and commercial paper  
Debt Instrument [Line Items]  
2022 0
2023 0
2024 0
2025 130,000
2026 0
Long-term debt $ 130,000