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Background, Organization, and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Other Property and Investments
Other Property and Investments. Other property and investments on the Condensed Consolidated Balance Sheets includes:
(Thousands of dollars)September 30, 2020December 31, 2019
Southwest Gas Corporation:
Net cash surrender value of COLI policies$133,761 $132,072 
Other property1,973 1,715 
Total Southwest Gas Corporation135,734 133,787 
Centuri property, equipment, and intangibles1,073,092 983,905 
Centuri accumulated provision for depreciation and amortization(406,590)(352,333)
Other property22,833 18,814 
Total Southwest Gas Holdings, Inc.$825,069 $784,173 
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, 2019$10,095 $332,928 $343,023 
Foreign currency translation adjustment— (2,826)(2,826)
September 30, 2020$10,095 $330,102 $340,197 
Schedule of Significant Items Included in Other Income (Deductions)
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)
202020192020201920202019
Southwest Gas Corporation - natural gas operations segment:
Change in COLI policies$4,500 $200 $1,000 $11,200 $7,200 $2,000 
Interest income1,412 1,521 3,214 4,940 4,630 6,659 
Equity AFUDC1,232 1,212 3,413 3,179 4,395 5,772 
Other components of net periodic benefit cost(5,005)(3,765)(15,016)(11,295)(18,780)(16,560)
Miscellaneous income and (expense)(388)(521)(3,558)(1,839)(5,060)(3,065)
Southwest Gas Corporation - total other income (deductions)1,751 (1,353)(10,947)6,185 (7,615)(5,194)
Utility infrastructure services segment:
Interest income— — — — — 82 
Foreign transaction gain (loss)— (6)(16)546 (16)66 
Miscellaneous income and (expense)48 177 (91)23 (194)514 
Centuri - total other income (deductions)48 171 (107)569 (210)662 
Corporate and administrative— 24 8 73 37 84 
Consolidated Southwest Gas Holdings, Inc. - total other income (deductions)
$1,799 $(1,158)$(11,046)$6,827 $(7,788)$(4,448)
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, 2019
$84,542 
Net income attributable to redeemable noncontrolling interest5,169 
 Redemption value adjustment17,573 
Balance, September 30, 2020
$107,284 
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)202020192020201920202019
Weighted average basic shares56,271 54,670 55,683 53,996 55,508 53,219 
Effect of dilutive securities:
Management Incentive Plan shares— 12 — 11 3 15 
Restricted stock units (1)86 66 70 56 66 53 
Weighted average diluted shares56,357 54,748 55,753 54,063 55,577 53,287 
(1) The number of securities included 76,000 and 55,000 performance shares during the three months ending September 30, 2020 and 2019, 63,000 and 48,000 performance shares during the nine months ending September 30, 2020 and 2019, and 57,000 and 44,000 performance shares during the twelve months ending September 30, 2020 and 2019, respectively, the total of which was derived by assuming that target performance will be achieved during the relevant performance period.