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Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 15, 2024
Jun. 30, 2023
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-37976    
Entity Registrant Name Southwest Gas Holdings, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 81-3881866    
Entity Address, Address Line One 8360 S. Durango Dr.    
Entity Address, Address Line Two Post Office Box 98510    
Entity Address, City or Town Las Vegas,    
Entity Address, State or Province NV    
Entity Address, Postal Zip Code 89193-8510    
City Area Code (702)    
Local Phone Number 876-7237    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 4,549,286,493
Entity Common Stock, Shares Outstanding   71,595,491  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
 
Description Part Into Which Incorporated
2024 Proxy Statement
 Part III
    
Entity Central Index Key 0001692115    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Financial Statement Error Correction [Flag] false    
Common stock shares      
Entity Information [Line Items]      
Title of 12(b) Security Southwest Gas Holdings, Inc. Common Stock, $1 par value    
Trading Symbol SWX    
Security Exchange Name NYSE    
Preferred Stock Purchase Rights      
Entity Information [Line Items]      
Title of 12(b) Security Preferred Stock Purchase Rights    
Security Exchange Name NYSE    
No Trading Symbol Flag true    
Southwest Gas Corporation      
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-7850    
Entity Registrant Name Southwest Gas Corporation    
Entity Incorporation, State or Country Code CA    
Entity Tax Identification Number 88-0085720    
Entity Address, Address Line One 8360 S. Durango Dr.    
Entity Address, Address Line Two Post Office Box 98510    
Entity Address, City or Town Las Vegas,    
Entity Address, State or Province NV    
Entity Address, Postal Zip Code 89193-8510    
City Area Code (702)    
Local Phone Number 876-7237    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
 
Description Part Into Which Incorporated
2024 Proxy Statement
 Part III
    
Entity Central Index Key 0000092416    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Financial Statement Error Correction [Flag] false