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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2017	Feb. 15, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	SWX
Entity Registrant Name	SOUTHWEST GAS HOLDINGS, INC.
Entity Central Index Key	0001692115
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		48,159,162
Entity Public Float			$ 3,476,422,674

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Utility plant:
Gas plant	$ 6,629,644	$ 6,193,760
Less: accumulated depreciation	(2,231,242)	(2,172,966)
Construction work in progress	125,248	111,177
Net utility plant (Note 2)	4,523,650	4,131,971
Other property and investments (Note 1)	428,180	342,343
Current assets:
Cash and cash equivalents	43,622	28,066
Accounts receivable, net of allowances (Note 4)	347,375	285,145
Accrued utility revenue (Note 3)	78,200	76,200
Income taxes receivable, net	7,960	4,455
Deferred purchased gas costs (Note 5)	14,581	2,608
Prepaids and other current assets (Notes 1, 5, and 14)	165,294	136,833
Total current assets	657,032	533,307
Noncurrent assets:
Goodwill (Note 1)	179,314	139,983
Deferred income taxes (Note 13)	1,480	1,288
Deferred charges and other assets (Notes 2, 5, and 14)	447,410	432,234
Total noncurrent assets	628,204	573,505
Total assets	6,237,066	5,581,126
Capitalization:
Common stock	49,720	49,112
Additional paid-in capital	955,332	903,123
Accumulated other comprehensive income (loss), net (Note 6)	(47,682)	(48,008)
Retained earnings	857,398	759,263
Total Southwest Gas Holdings, Inc. equity	1,814,768	1,663,490
Noncontrolling interest	(2,365)	(2,217)
Total equity	1,812,403	1,661,273
Redeemable noncontrolling interest (Note 17)		22,590
Long-term debt, less current maturities (Note 8)	1,798,576	1,549,983
Total capitalization	3,610,979	3,233,846
Commitments and contingencies (Note 10)
Current liabilities:
Current maturities of long-term debt (Note 8)	25,346	50,101
Short-term debt (Note 9)	214,500
Accounts payable	228,315	184,669
Customer deposits	69,781	72,296
Income taxes payable, net	5,946	1,909
Accrued general taxes	43,879	42,921
Accrued interest	17,870	17,939
Deferred purchased gas costs (Note 5)	6,841	90,476
Other current liabilities (Notes 2, 5, and 14)	203,403	168,064
Total current liabilities	815,881	628,375
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits, net (Note 13)	476,960	840,653
Accumulated removal costs (Note 5)	315,000	308,000
Other deferred credits and other long-term liabilities (Notes 2, 5, 11, and 14)	1,018,246	570,252
Total deferred income taxes and other credits	1,810,206	1,718,905
Total capitalization and liabilities	6,237,066	5,581,126
Southwest Gas Corporation [Member]
Utility plant:
Gas plant	6,629,644	6,193,760
Less: accumulated depreciation	(2,231,242)	(2,172,966)
Construction work in progress	125,248	111,177
Net utility plant (Note 2)	4,523,650	4,131,971
Other property and investments (Note 1)	119,114	108,569
Current assets:
Cash and cash equivalents	37,946	19,024
Accounts receivable, net of allowances (Note 4)	119,748	111,845
Accrued utility revenue (Note 3)	78,200	76,200
Income taxes receivable, net		4,455
Deferred purchased gas costs (Note 5)	14,581	2,608
Prepaids and other current assets (Notes 1, 5, and 14)	153,771	126,363
Total current assets	404,246	340,495
Noncurrent assets:
Goodwill (Note 1)	10,095	10,095
Deferred charges and other assets (Notes 2, 5, and 14)	425,564	410,625
Discontinued operations - construction services - assets (Note 18)		579,371
Total noncurrent assets	435,659	1,000,091
Total assets	5,482,669	5,581,126
Capitalization:
Common stock	49,112	49,112
Additional paid-in capital	948,767	897,346
Accumulated other comprehensive income (loss), net (Note 6)	(47,073)	(45,639)
Retained earnings	659,193	767,061
Total Southwest Gas Holdings, Inc. equity	1,609,999	1,667,880
Discontinued operations - construction services non-owner equity		15,983
Long-term debt, less current maturities (Note 8)	1,521,031	1,375,080
Total capitalization	3,131,030	3,058,943
Commitments and contingencies (Note 10)
Current liabilities:
Current maturities of long-term debt (Note 8)		25,000
Short-term debt (Note 9)	191,000
Accounts payable	158,474	138,229
Customer deposits	69,781	72,296
Income taxes payable, net	4,971
Accrued general taxes	43,879	42,921
Accrued interest	17,171	17,395
Deferred purchased gas costs (Note 5)	6,841	90,476
Payable to parent	194
Other current liabilities (Notes 2, 5, and 14)	108,785	95,999
Total current liabilities	601,096	482,316
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits, net (Note 13)	445,243	806,109
Accumulated removal costs (Note 5)	315,000	308,000
Other deferred credits and other long-term liabilities (Notes 2, 5, 11, and 14)	990,300	545,143
Discontinued operations - construction services - liabilities (Note 18)		380,615
Total deferred income taxes and other credits	1,750,543	2,039,867
Total capitalization and liabilities	$ 5,482,669	$ 5,581,126

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common stock, par	$ 1	$ 1
Common stock, authorized	60,000,000	60,000,000
Common stock, issued	48,090,470	47,482,068
Common stock, outstanding	48,090,470	47,482,068

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating revenues:
Gas operating revenues (Note 3)	$ 1,302,308	$ 1,321,412	$ 1,454,639
Construction revenues (Note 3)	1,246,484	1,139,078	1,008,986
Total operating revenues	2,548,792	2,460,490	2,463,625
Gas operating revenues (Note 3)	1,302,308	1,321,412	1,454,639
Operating expenses:
Net cost of gas sold	355,045	397,121	563,809
Operations and maintenance	412,187	401,724	393,199
Depreciation and amortization	250,951	289,132	270,111
Taxes other than income taxes	57,946	52,376	49,393
Construction expenses	1,148,963	1,024,423	898,781
Total operating expenses	2,225,092	2,164,776	2,175,293
Operating income	323,700	295,714	288,332
Other income and (expenses):
Net interest deductions (Notes 8 and 9)	(78,064)	(73,660)	(71,879)
Other income (deductions)	13,394	9,469	2,879
Total other income and (expenses)	(64,670)	(64,191)	(69,000)
Income before income taxes	259,030	231,523	219,332
Income tax expense (Note 13)	65,088	78,468	79,902
Net income	193,942	153,055	139,430
Net income attributable to noncontrolling interests	101	1,014	1,113
Net income	$ 193,841	$ 152,041	$ 138,317
Basic earnings per share (Notes 1 and 16)	$ 4.04	$ 3.20	$ 2.94
Diluted earnings per share (Notes 1 and 16)	$ 4.04	$ 3.18	$ 2.92
Average number of common shares	47,965	47,469	46,992
Average shares (assuming dilution)	47,991	47,814	47,383
Southwest Gas Corporation [Member]
Operating revenues:
Gas operating revenues (Note 3)	$ 1,302,308	$ 1,321,412	$ 1,454,639
Gas operating revenues (Note 3)	1,302,308	1,321,412	1,454,639
Operating expenses:
Net cost of gas sold	355,045	397,121	563,809
Operations and maintenance	410,745	401,724	393,199
Depreciation and amortization	201,922	233,463	213,455
Taxes other than income taxes	57,946	52,376	49,393
Total operating expenses	1,025,658	1,084,684	1,219,856
Operating income	276,650	236,728	234,783
Other income and (expenses):
Net interest deductions (Notes 8 and 9)	(69,733)	(66,997)	(64,095)
Other income (deductions)	13,036	8,276	2,292
Total other income and (expenses)	(56,697)	(58,721)	(61,803)
Income before income taxes	219,953	178,007	172,980
Income tax expense (Note 13)	63,135	58,584	61,355
Net income	156,818	153,055	139,430
Net income (loss) from continuing operations	156,818	119,423	111,625
Discontinued operations-construction services, income before income taxes		53,516	46,352
Discontinued operations-construction services, Income tax expense		19,884	18,547
Discontinued operations-construction services, Income		33,632	27,805
Discontinued operations-construction services - Noncontrolling interests		1,014	1,113
Income - discontinued operations		32,618	26,692
Net income	$ 156,818	$ 152,041	$ 138,317

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Income	$ 193,942	$ 153,055	$ 139,430
Defined benefit pension plans (Notes 6 and 11):
Net actuarial gain (loss)	(32,701)	(14,118)	(18,922)
Amortization of prior service cost	828	828	828
Amortization of net actuarial loss	15,776	16,781	21,316
Regulatory adjustment	12,590	(3,462)	(3,500)
Net defined benefit pension plans	(3,507)	29	(278)
Forward-starting interest rate swaps:
Amounts reclassified into net income (Notes 6 and 14)	2,073	2,075	2,073
Net forward-starting interest rate swaps	2,073	2,075	2,073
Foreign currency translation adjustments	1,771	161	(1,954)
Total other comprehensive income (loss), net of tax	337	2,265	(159)
Comprehensive income	194,279	155,320	139,271
Comprehensive income attributable to noncontrolling interests	112	1,019	1,047
Comprehensive income	194,167	154,301	138,224
Southwest Gas Corporation [Member]
Net Income from continuing operations	156,818	119,423	111,625
Net Income	156,818	153,055	139,430
Defined benefit pension plans (Notes 6 and 11):
Net actuarial gain (loss)	(32,701)	(14,118)	(18,922)
Amortization of prior service cost	828	828	828
Amortization of net actuarial loss	15,776	16,781	21,316
Regulatory adjustment	12,590	(3,462)	(3,500)
Net defined benefit pension plans	(3,507)	29	(278)
Forward-starting interest rate swaps:
Amounts reclassified into net income (Notes 6 and 14)	2,073	2,075	2,073
Net forward-starting interest rate swaps	2,073	2,075	2,073
Total other comprehensive income (loss), net of tax	(1,434)	2,104	1,795
Comprehensive income	155,384	121,527	113,420
Discontinued operations-construction services, net income		32,618	26,692
Discontinued operations-construction services, foreign currency translation adjustments		161	(1,954)
Discontinued operations-construction services, comprehensive income		32,779	24,738
Discontinued operations-construction services, comprehensive income (loss) attributable to noncontrolling interests		5	(66)
Comprehensive income attributable to discontinued operations - construction services		32,774	24,804
Comprehensive income	$ 155,384	$ 154,301	$ 138,224

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOW FROM OPERATING ACTIVITIES:
Net Income	$ 193,942	$ 153,055	$ 139,430
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	250,951	289,132	270,111
Deferred income taxes	63,389	68,732	48,785
Changes in current assets and liabilities:
Accounts receivable, net of allowances	(40,947)	30,096	(39,850)
Accrued utility revenue	(2,000)	(1,500)	(800)
Deferred purchased gas costs	(95,608)	45,858	129,566
Accounts payable	19,961	21,695	(3,491)
Accrued taxes	2,112	26,340	(8,405)
Other current assets and liabilities	(8,203)	(27,432)	23,213
Gains on sale	(4,196)	(7,148)	(3,102)
Changes in undistributed stock compensation	10,888	5,456	2,914
AFUDC	(2,296)	(2,289)	(3,008)
Changes in other assets and deferred charges	(22,269)	16,960	(14,166)
Changes in other liabilities and deferred credits	4,231	(18,447)	10,863
Net cash provided by operating activities	369,955	600,508	552,060
CASH FLOW FROM INVESTING ACTIVITIES:
Construction expenditures and property additions	(623,649)	(529,531)	(488,000)
Acquisition of businesses, net of cash acquired	(94,204)	(17,000)	(9,261)
Restricted cash			785
Changes in customer advances	323	7,900	18,300
Miscellaneous inflows	16,645	13,039	8,354
Net cash used in investing activities	(700,885)	(525,592)	(469,822)
CASH FLOW FROM FINANCING ACTIVITIES:
Issuance of common stock, net	41,155	472	35,396
Dividends paid	(92,130)	(83,317)	(74,248)
Centuri distribution to redeemable noncontrolling interest	(204)	(439)	(99)
Issuance of long-term debt, net	407,063	423,946	135,816
Retirement of long-term debt	(338,969)	(255,273)	(187,973)
Change in credit facility and commercial paper	145,000	(145,000)
Change in short-term debt	214,500	(18,000)	13,000
Principal payments on capital lease obligations	(980)	(1,354)	(1,420)
Redemption of Centuri shares from noncontrolling parties	(23,000)
Withholding remittance - share-based compensation	(3,176)	(2,119)	(4,913)
Other	(3,074)	(1,569)	41
Net cash provided by (used in) financing activities	346,185	(82,653)	(84,400)
Effects of currency translation on cash and cash equivalents	301	(194)	(1,407)
Change in cash and cash equivalents	15,556	(7,931)	(3,569)
Cash and cash equivalents at beginning of period	28,066	35,997	39,566
Cash and cash equivalents at end of period	43,622	28,066	35,997
Supplemental information:
Interest paid, net of amounts capitalized	71,943	67,440	66,623
Income taxes paid (received)	5,673	(19,032)	43,225
Southwest Gas Corporation [Member]
CASH FLOW FROM OPERATING ACTIVITIES:
Net Income	156,818	153,055	139,430
Income (loss) from discontinued operations		33,632	27,805
Net income (loss) from continuing operations	156,818	119,423	111,625
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	201,922	233,463	213,455
Deferred income taxes	67,169	67,959	53,396
Changes in current assets and liabilities:
Accounts receivable, net of allowances	(7,902)	40,731	(12,444)
Accrued utility revenue	(2,000)	(1,500)	(800)
Deferred purchased gas costs	(95,608)	45,858	129,566
Accounts payable	4,545	16,183	(8,751)
Accrued taxes	10,383	19,391	(1,626)
Other current assets and liabilities	(13,726)	(33,496)	21,736
Changes in undistributed stock compensation	9,288	5,456	2,914
AFUDC	(2,296)	(2,289)	(3,008)
Changes in other assets and deferred charges	(22,918)	16,611	(14,513)
Changes in other liabilities and deferred credits	3,541	(18,447)	10,863
Net cash provided by operating activities	309,216	509,343	502,413
CASH FLOW FROM INVESTING ACTIVITIES:
Construction expenditures and property additions	(560,448)	(457,119)	(438,289)
Changes in customer advances	323	7,900	18,300
Miscellaneous inflows	2,741	2,982	3,262
Dividends received		12,461	2,801
Net cash used in investing activities	(557,384)	(433,776)	(413,926)
CASH FLOW FROM FINANCING ACTIVITIES:
Issuance of common stock, net		472	35,396
Contributions from parent	41,359
Dividends paid	(81,497)	(83,317)	(74,248)
Issuance of long-term debt, net		296,469
Retirement of long-term debt	(25,000)	(124,855)	(51,200)
Change in credit facility and commercial paper	145,000	(145,000)
Change in short-term debt	191,000	(18,000)	13,000
Withholding remittance - share-based compensation	(3,176)	(2,119)	(4,913)
Other	(596)	(1,569)	92
Net cash provided by (used in) financing activities	267,090	(77,919)	(81,873)
Net cash provided by discontinued operating activities		91,165	49,647
Net cash used in discontinued investing activities		(91,816)	(55,896)
Net cash provided by (used in) discontinued financing activities		(4,734)	(2,527)
Effects of currency translation on cash and cash equivalents		(194)	(1,407)
Change in cash and cash equivalents	18,922	(7,931)	(3,569)
Change in cash and cash equivalents of discontinued operations included in discontinued operations construction services assets		5,579	10,183
Change in cash and cash equivalents of continuing operations	18,922	(2,352)	6,614
Cash and cash equivalents at beginning of period	19,024	21,376	14,762
Cash and cash equivalents at end of period	37,946	19,024	21,376
Supplemental information:
Interest paid, net of amounts capitalized	64,790	61,501	59,161
Income taxes paid (received)	$ (7,854)	$ (31,011)	$ 13,544

Consolidated Statements Of Equity - USD ($)
$ in Thousands

Total