CONDENSED CONSOLIDATED STATEMENTS OF INCOME - Southwest - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Regulated operations revenues	$ 367,122	$ 255,848	$ 1,550,684	$ 1,070,576	$ 2,001,898	$ 1,445,066
Operating expenses:
Net cost of gas sold	100,991	63,710	547,769	296,227	682,449	374,449
Operations and maintenance	154,236	122,927	479,330	334,450	618,026	437,602
Depreciation and amortization	116,933	91,380	347,589	267,670	450,960	354,688
Taxes other than income taxes	23,356	20,109	70,778	60,134	90,987	76,087
Total operating expenses	1,075,651	865,396	3,275,026	2,340,005	4,245,925	3,101,290
Operating income (loss)	49,937	23,300	264,091	256,019	377,619	408,814
Other income and (expenses):
Net interest deductions	(64,373)	(31,298)	(165,942)	(81,201)	(203,939)	(109,537)
Other income (deductions)	1,593	(3,112)	2	(3,975)	478	282
Total other income and (expenses)	(62,780)	(34,410)	(165,940)	(85,176)	(203,461)	(109,255)
Income (loss) before income taxes	(12,843)	(11,110)	98,151	170,843	174,158	299,559
Income tax expense (benefit)	(1,525)	(1,816)	18,300	34,818	23,130	58,498
Net income (loss) attributable to Southwest Gas Holdings, Inc.	(12,309)	(11,576)	77,294	130,836	147,237	234,380
Southwest Gas Corporation
Regulated operations revenues	303,944	255,848	1,358,425	1,070,576	1,809,639	1,445,066
Operating expenses:
Net cost of gas sold	100,441	63,710	544,216	296,227	678,896	374,449
Operations and maintenance	121,537	119,708	368,984	328,980	478,554	431,795
Depreciation and amortization	64,390	61,359	192,434	187,688	258,144	249,118
Taxes other than income taxes	20,693	20,109	62,443	60,134	82,652	76,087
Total operating expenses	307,061	264,886	1,168,077	873,029	1,498,246	1,131,449
Operating income (loss)	(3,117)	(9,038)	190,348	197,547	311,393	313,617
Other income and (expenses):
Net interest deductions	(29,417)	(24,922)	(84,660)	(71,263)	(110,957)	(97,259)
Other income (deductions)	1,678	(4,287)	(440)	(4,902)	(97)	(545)
Total other income and (expenses)	(27,739)	(29,209)	(85,100)	(76,165)	(111,054)	(97,804)
Income (loss) before income taxes	(30,856)	(38,247)	105,248	121,382	200,339	215,813
Income tax expense (benefit)	(8,657)	(10,703)	17,918	18,798	28,458	33,679
Net income (loss) attributable to Southwest Gas Holdings, Inc.	$ (22,199)	$ (27,544)	$ 87,330	$ 102,584	$ 171,881	$ 182,134