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Background, Organization, and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Other Property and Investments Other property and investments on Southwest’s and the Company’s Consolidated Balance Sheets includes:
December 31,
(Thousands of dollars)20222021
Net cash surrender value of COLI policies$136,245 $149,947 
Other property33,152 3,146 
Total Southwest Gas Corporation169,397 153,093 
Non-regulated property, equipment, and intangibles1,677,218 1,616,392 
Non-regulated accumulated provision for depreciation and amortization(596,518)(512,343)
Other property and investments31,075 59,337 
Total Southwest Gas Holdings, Inc.$1,281,172 $1,316,479 
Summary of Intangible Assets Centuri’s intangible assets (other than goodwill) have finite lives and are associated with businesses previously acquired. The balances at December 31, 2022 and 2021, respectively, were as follows:
December 31, 2022
(Thousands of dollars)
Gross Carrying
Amount
Accumulated
Amortization
Net Carrying
Amount
Customer relationships$391,758 $(63,509)$328,249 
Trade names and trademarks79,277 (12,278)66,999 
Total$471,035 $(75,787)$395,248 
December 31, 2021
Customer relationships$393,834 $(42,886)$350,948 
Trade names and trademarks79,650 (7,093)72,557 
Customer contracts backlog4,500 (1,500)3,000 
Total$477,984 $(51,479)$426,505 
Schedule of Estimated Future Amortization of Intangible Assets
The estimated future amortization of the intangible assets for the next five years and thereafter is as follows:
(Thousands of dollars)
2023$26,690 
202426,690 
202526,678 
202626,455 
202726,088 
Thereafter262,647 
Total$395,248 
Schedule of Goodwill
Goodwill in the Natural Gas Distribution and Utility Infrastructure Services segments is included in their respective Consolidated Balance Sheets as follows:
(Thousands of dollars)Natural Gas DistributionUtility Infrastructure Services
Total
Company
Balance, December 31, 2020$10,095 $335,089 $345,184 
Additional goodwill from Riggs Distler acquisition— 449,501 449,501 
Foreign currency translation adjustment— 468 468 
Balance, December 31, 202110,095 785,058 $795,153 
Additional goodwill from Graham County acquisition1,060 — 1,060 
Measurement-period adjustments from Riggs Distler acquisition— (1,924)(1,924)
Foreign currency translation adjustment— (7,039)(7,039)
Balance, December 31, 2022$11,155 $776,095 $787,250 
Schedule of Capitalized and Debt Portion of AFUDC Regulated operations plant construction costs, including AFUDC, are recoverable as part of authorized rates through depreciation when completed projects are placed into operation, and general rate relief is requested and granted. AFUDC, disaggregated by type, included in the Company’s and Southwest’s Consolidated Statements of Income are presented in the table below:
(Thousands of dollars)202220212020
AFUDC:
Debt portion$3,535 $1,046 $3,202 
Equity portion— — 4,724 
AFUDC capitalized as part of regulated operations plant$3,535 $1,046 $7,926 
AFUDC rate2.64 %0.96 %5.51 %
Schedule of Other Income (Deductions) The following table provides the composition of significant items included in Other income (deductions) on the Consolidated Statements of Income: 
(Thousands of dollars)202220212020
Southwest Gas Corporation:
Change in COLI policies$(5,400)$8,800 $9,200 
Interest income16,183 5,113 4,015 
Equity AFUDC— — 4,724 
Other components of net periodic benefit cost(751)(14,021)(20,022)
Miscellaneous income and (expense)(16,916)(4,451)(4,507)
Southwest Gas Corporation – total other income (deductions)(6,884)(4,559)(6,590)
Centuri, MountainWest, and Southwest Gas Holdings, Inc.:
Foreign transaction gain (loss)977 (22)(16)
Equity AFUDC465 — — 
Equity in earnings of unconsolidated investments2,629 226 80 
Miscellaneous income and (expense)(3,113)863 (271)
Corporate and administrative(263)$(7)$8 
Southwest Gas Holdings, Inc. - total other income (deductions)$(6,189)$(3,499)$(6,789)
Schedule of Earnings Per Share, Basic and Diluted A reconciliation of the denominator used in Basic and Diluted EPS calculations is shown in the following table:
(In thousands)202220212020
Weighted average basic shares65,558 59,145 55,998 
Effect of dilutive securities:
Restricted stock units (1)(2)— 114 78 
Weighted average diluted shares65,558 59,259 56,076 
(1) The number of anti-dilutive restricted stock units for 2022 excluded from the calculation of diluted shares is 157,000.
(2) The number of securities granted for 2022, 2021, and 2020 includes 144,000, 104,000, and 69,000 performance shares, respectively, the total of which was derived by assuming that target performance will be achieved during the relevant performance period.