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Other Comprehensive Income and Accumulated Other Comprehensive Income ("AOCI") (Tables)
 12 Months Ended
Dec. 31, 2023
Equity [Abstract]  
Schedule of Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss)
Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss):
December 31,
202320222021
(Thousands of dollars)
Before-
Tax
Amount
Tax (Expense) or
Benefit (1)
Net-of-
Tax
Amount
Before-
Tax
Amount
Tax
(Expense)
or
Benefit (1)
Net-of-
Tax
Amount
Before-
Tax
Amount
Tax
(Expense)
or
Benefit (1)
Net-of-
Tax
Amount
Defined benefit pension plans:
Net actuarial gain/(loss)$(3,188)$765 $(2,423)$4,079 $(980)$3,099 $59,176 $(14,202)$44,974 
Amortization of prior service cost175 (42)133 175 (42)133 959 (230)729 
Amortization of net actuarial (gain)/loss1,333 (319)1,014 34,818 (8,357)26,461 44,597 (10,703)33,894 
Regulatory adjustment(1,330)319 (1,011)(28,232)6,775 (21,457)(88,194)21,167 (67,027)
Pension plans other comprehensive income (loss)
(3,010)723 (2,287)10,840 (2,604)8,236 16,538 (3,968)12,570 
FSIRS (designated hedging activities):
Amounts reclassified into net income— — — 545 (129)416 2,174 (522)1,652 
FSIRS other comprehensive income (loss)— — — 545 (129)416 2,174 (522)1,652 
Total other comprehensive income (loss) –Southwest Gas Corporation
(3,010)723 (2,287)11,385 (2,733)8,652 18,712 (4,490)14,222 
Foreign currency translation adjustments:
Translation adjustments2,742 — 2,742 (6,133)— (6,133)20 — 20 
Foreign currency other comprehensive income (loss)
2,742 — 2,742 (6,133)— (6,133)20 — 20 
Total other comprehensive income (loss) – Southwest Gas Holdings, Inc.
$(268)$723 $455 $5,252 $(2,733)$2,519 $18,732 $(4,490)$14,242 
(1) Tax amounts are calculated using a 24% rate. With regard to foreign currency translation adjustments, the Company has elected to indefinitely reinvest the earnings of Centuri’s Canadian subsidiaries in Canada, thus preventing deferred taxes on such earnings. As a result of this assertion, and no repatriation of earnings anticipated, the Company is not recognizing a tax effect or presenting a tax expense or benefit for currency translation adjustments in Other comprehensive income (loss).
Schedule of Rollforward of Accumulated Other Comprehensive Income
The following table represents a rollforward of AOCI, presented on the Company’s Consolidated Balance Sheets and its Consolidated Statements of Equity:
  Defined Benefit PlansForeign Currency Items  
(Thousands of dollars)Before-Tax
Tax
(Expense)
Benefit (3)
After-TaxBefore-
Tax		Tax
(Expense)
Benefit		After-TaxAOCI
Beginning Balance AOCI December 31, 2022
$(50,342)$12,081 $(38,261)$(5,981)$— $(5,981)$(44,242)
Net actuarial gain/(loss)(3,188)765 (2,423)— — — (2,423)
Translation adjustments— — — 2,742 — 2,742 2,742 
Amortization of prior service cost (1)
175 (42)133 — — — 133 
Amortization of net actuarial loss (1)
1,333 (319)1,014 — — — 1,014 
Regulatory adjustment (2)
(1,330)319 (1,011)— — (1,011)
Net current period other comprehensive income (loss) attributable to Southwest Gas Holdings, Inc.(3,010)723 (2,287)2,742 — 2,742 455 
Ending Balance AOCI December 31, 2023
$(53,352)$12,804 $(40,548)$(3,239)$— $(3,239)$(43,787)
(1)These AOCI components are included in the computation of net periodic benefit cost (see Note 11 - Pension and Other Postretirement Benefits for additional details).
(2)The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in Deferred charges and other assets on the Company’s Consolidated Balance Sheets).
(3)     Tax amounts are calculated using a 24% rate.
The following table represents a rollforward of AOCI, presented on Southwest’s Consolidated Balance Sheets:
  Defined Benefit Plans
(Thousands of dollars)Before-Tax
Tax
(Expense)
Benefit (6)
After-
Tax
Beginning Balance AOCI December 31, 2022
$(50,342)$12,081 $(38,261)
Net actuarial gain/(loss)(3,188)765 (2,423)
Amortization of prior service cost (4)
175 (42)133 
Amortization of net actuarial loss (4)
1,333 (319)1,014 
Regulatory adjustment (5)(1,330)319 (1,011)
Net current period other comprehensive income (loss) attributable to Southwest Gas Corporation
(3,010)723 (2,287)
Ending Balance AOCI December 31, 2023
$(53,352)$12,804 $(40,548)
(4)    These AOCI components are included in the computation of net periodic benefit cost (see Note 11 - Pension and Other Postretirement Benefits for additional details).
(5)    The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in Deferred charges and other assets on Southwest’s Consolidated Balance Sheets).
(6)    Tax amounts are calculated using a 24% rate.
Schedule of Amount Recognized Before Income Tax in Accumulated Other Comprehensive Income
The following table represents amounts (before income tax impacts) included in AOCI (in the tables above), that have not yet been recognized in net periodic benefit cost:
December 31,
(Thousands of dollars)20232022
Net actuarial loss$(361,968)$(360,113)
Prior service cost(1,178)(1,353)
Less: amount recognized in regulatory assets309,794 311,124 
Recognized in AOCI$(53,352)$(50,342)
Other Changes in Plan Assets and Benefit Obligations Recognized in Net Periodic Benefit Cost and Other Comprehensive Income
Year Ended December 31,
 202320222021
  (Thousands of dollars)Total
Qualified
Retirement
Plan
SERPPBOPTotal
Qualified
Retirement
Plan
SERPPBOPTotal
Qualified
Retirement
Plan
SERPPBOP
Net actuarial loss (gain) (a)
$3,188 $455 $3,995 $(1,262)$(4,079)$11,049 $(6,133)$(8,995)$(59,176)$(54,892)$(3,245)$(1,039)
Amortization of prior service cost (b)
(175)— — (175)(175)— — (175)(959)— — (959)
Amortization of net
actuarial loss (b)
(1,333)(335)(998)— (34,818)(32,468)(2,350)— (44,597)(41,955)(2,642)— 
Regulatory adjustment
1,330 (107)— 1,437 28,232 19,062 — 9,170 88,194 86,196 — 1,998 
Recognized in other comprehensive (income) loss
3,010 13 2,997 — (10,840)(2,357)(8,483)— (16,538)(10,651)(5,887)— 
Net periodic benefit costs recognized in net income
6,972 1,279 3,371 2,322 47,226 41,671 4,215 1,340 57,397 51,194 4,599 1,604 
Total of amount recognized in net periodic benefit cost and other comprehensive (income) loss
$9,982 $1,292 $6,368 $2,322 $36,386 $39,314 $(4,268)$1,340 $40,859 $40,543 $(1,288)$1,604