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Background, Organization, and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 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)June 30, 2020December 31, 2019
Southwest Gas Corporation:
Net cash surrender value of COLI policies$128,659  $132,072  
Other property1,975  1,715  
Total Southwest Gas Corporation130,634  133,787  
Centuri property, equipment, and intangibles1,041,528  983,905  
Centuri accumulated provision for depreciation and amortization(384,108) (352,333) 
Other property21,057  18,814  
Total Southwest Gas Holdings, Inc.$809,111  $784,173  
Schedule of Goodwill
(Thousands of dollars)Natural Gas
Operations		Utility Infrastructure
Services		Total Company
December 31, 2019$10,095  $332,928  $343,023  
Foreign currency translation adjustment—  (5,045) (5,045) 
June 30, 2020$10,095  $327,883  $337,978  
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 June 30,Six Months Ended
June 30,		Twelve Months Ended June 30,
(Thousands of dollars)
202020192020201920202019
Southwest Gas Corporation - natural gas operations segment:
Change in COLI policies$12,000  $3,400  $(3,500) $11,000  $2,900  $6,500  
Interest income414  1,822  1,802  3,419  4,739  6,644  
Equity AFUDC1,120  1,007  2,181  1,967  4,375  5,008  
Other components of net periodic benefit cost(5,006) (3,765) (10,011) (7,530) (17,540) (18,060) 
Miscellaneous income and (expense)(690) (872) (3,170) (1,318) (5,193) (3,097) 
Southwest Gas Corporation - total other income (deductions)7,838  1,592  (12,698) 7,538  (10,719) (3,005) 
Utility infrastructure services segment:
Interest income—  —  —  —  —  86  
Foreign transaction gain (loss)(6) 21  (16) 552  (22) (19) 
Miscellaneous income and (expense)93  (498) (139) (154) (65) 462  
Centuri - total other income (deductions)87  (477) (155) 398  (87) 529  
Corporate and administrative—  31  8  49  61  75  
Consolidated Southwest Gas Holdings, Inc. - total other income (deductions)
$7,925  $1,146  $(12,845) $7,985  $(10,745) $(2,401) 
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 interest2,379  
Balance, June 30, 2020
$86,921  
Schedule of Earnings Per Share, Basic and Diluted A reconciliation of the denominator used in the Basic and Diluted EPS calculations is shown in the following table:
Three Months Ended
June 30,		Six Months Ended
June 30,		Twelve Months Ended
June 30,
(In thousands)202020192020201920202019
Average basic shares55,462  53,935  55,386  53,654  55,105  51,914  
Effect of dilutive securities:
Management Incentive Plan shares—  11  —  11  6  18  
Restricted stock units (1)70  57  62  51  60  45  
Average diluted shares55,532  54,003  55,448  53,716  55,171  51,977  
(1) The number of securities granted included 63,000 and 49,000 performance shares during the three months ending June 30, 2020 and 2019, 57,000 and 45,000 performance shares during the six months ending June 30, 2020 and 2019, and 51,000 and 36,000 performance shares during the twelve months ending June 30, 2020 and 2019, respectively, the total of which was derived by assuming that target performance will be achieved during the relevant performance period.