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Background, Organization, and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Other Property and Investments Other property and investments on the Condensed Consolidated Balance Sheets includes:
(Thousands of dollars)September 30, 2021December 31, 2020
Southwest Gas Corporation:
Net cash surrender value of COLI policies$147,187 $140,874 
Other property2,739 2,737 
Total Southwest Gas Corporation149,926 143,611 
Centuri property, equipment, and intangibles1,592,461 1,089,414 
Centuri accumulated provision for depreciation and amortization(468,206)(422,741)
Other property and investments31,153 23,961 
Total Southwest Gas Holdings, Inc.$1,305,334 $834,245 
Schedule of Goodwill Goodwill on Southwest’s and the Company’s Condensed Consolidated Balance Sheets includes:
(Thousands of dollars)Natural Gas
Operations		Utility Infrastructure
Services		Total Company
December 31, 2020$10,095 $335,089 $345,184 
Additional goodwill from Riggs Distler acquisition— 446,794 446,794 
Foreign currency translation adjustment— (76)(76)
September 30, 2021$10,095 $781,807 $791,902 
Schedule of Significant Items Included in Other Income (Deductions) The following table provides the composition of significant items included in Other income (deductions) in the Condensed Consolidated Statements of Income:
 Three Months Ended September 30,Nine Months Ended
September 30,		Twelve Months Ended
September 30,
(Thousands of dollars)
202120202021202020212020
Southwest Gas Corporation - natural gas operations segment:
Change in COLI policies$— $4,500 $5,800 $1,000 $14,000 $7,200 
Interest income1,365 1,412 3,312 3,214 4,113 4,630 
Equity AFUDC— 1,232 — 3,413 1,311 4,395 
Other components of net periodic benefit cost(3,506)(5,005)(10,516)(15,016)(15,522)(18,780)
Miscellaneous income and (expense)(2,146)(388)(3,498)(3,558)(4,447)(5,060)
Southwest Gas Corporation - total other income (deductions)(4,287)1,751 (4,902)(10,947)(545)(7,615)
Utility infrastructure services segment:
Foreign transaction gain (loss)(7)— (19)(16)(19)(16)
Miscellaneous income and (expense)1,182 48 946 (91)846 (194)
Centuri - total other income (deductions)1,175 48 927 (107)827 (210)
Corporate and administrative— — — 8 — 37 
Consolidated Southwest Gas Holdings, Inc. - total other income (deductions)
$(3,112)$1,799 $(3,975)$(11,046)$282 $(7,788)
Summary of Redeemable Noncontrolling Interest The following depicts the change to the balance of the redeemable noncontrolling interest:
(Thousands of dollars):Redeemable Noncontrolling Interest
Balance, December 31, 2020
$165,716 
Net income attributable to redeemable noncontrolling interest5,189 
 Redemption value adjustment12,642 
Balance, September 30, 2021
$183,547 
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:
Three Months Ended
September 30,		Nine Months Ended
September 30,		Twelve Months Ended
September 30,
(In thousands)202120202021202020212020
Weighted average basic shares59,688 56,271 58,639 55,683 58,209 55,508 
Effect of dilutive securities:
Management Incentive Plan shares— — — — — 3 
Restricted stock units (1)128 86 103 70 103 66 
Weighted average diluted shares59,816 56,357 58,742 55,753 58,312 55,577 
(1) The number of securities included 115,000 and 76,000 performance shares during the three months ending September 30, 2021 and 2020, 95,000 and 63,000 performance shares during the nine months ending September 30, 2021 and 2020, and 93,000 and 57,000 performance shares during the twelve months ending September 30, 2021 and 2020, respectively, the total of which was derived by assuming that target performance will be achieved during the relevant performance period.