Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Utility plant:
Gas plant	$ 5,618,385	$ 5,556,599
Less: accumulated depreciation	(2,002,883)	(1,973,098)
Acquisition adjustments, net	505	550
Construction work in progress	81,001	74,332
Net utility plant	3,697,008	3,658,383
Other property and investments	319,689swx_OtherPropertyAndInvestments	326,743swx_OtherPropertyAndInvestments
Restricted cash	755	821
Current assets:
Cash and cash equivalents	38,013	39,566
Accounts receivable, net of allowances	314,682us-gaap_AccountsReceivableNetCurrent	281,824us-gaap_AccountsReceivableNetCurrent
Accrued utility revenue	44,400us-gaap_OtherReceivables	73,900us-gaap_OtherReceivables
Income taxes receivable, net	3,881us-gaap_IncomeTaxesReceivable	21,853us-gaap_IncomeTaxesReceivable
Deferred income taxes, net	8,429us-gaap_DeferredTaxAssetsNetCurrent	2,109us-gaap_DeferredTaxAssetsNetCurrent
Deferred purchased gas costs	28,523us-gaap_DeferredGasCost	87,556us-gaap_DeferredGasCost
Prepaids and other current assets	89,317	99,975
Total current assets	527,245us-gaap_AssetsCurrent	606,783us-gaap_AssetsCurrent
Noncurrent assets:
Goodwill	135,689us-gaap_Goodwill	143,160us-gaap_Goodwill
Deferred income taxes	1,418us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred charges and other assets	472,593us-gaap_OtherAssetsNoncurrent	478,625us-gaap_OtherAssetsNoncurrent
Total noncurrent assets	609,700us-gaap_AssetsNoncurrent	621,785us-gaap_AssetsNoncurrent
Total assets	5,154,397us-gaap_Assets	5,214,515us-gaap_Assets
Capitalization:
Common stock, $1 par (authorized - 60,000,000 shares; issued and outstanding - 46,840,289 and 46,523,184 shares)	48,470us-gaap_CommonStockValue	48,153us-gaap_CommonStockValue
Additional paid-in capital	862,955	851,381
Accumulated other comprehensive income (loss), net	(50,177)	(50,175)
Retained earnings	692,603	639,164
Total Southwest Gas Corporation equity	1,553,851us-gaap_StockholdersEquity	1,488,523us-gaap_StockholdersEquity
Noncontrolling interest	(2,116)us-gaap_MinorityInterest	(2,257)us-gaap_MinorityInterest
Total equity	1,551,735	1,486,266
Redeemable noncontrolling interest	19,096	20,042
Long-term debt, less current maturities	1,506,527us-gaap_LongTermDebtNoncurrent	1,637,592us-gaap_LongTermDebtNoncurrent
Total capitalization	3,077,358	3,143,900
Current liabilities:
Current maturities of long-term debt	18,266us-gaap_LongTermDebtCurrent	19,192us-gaap_LongTermDebtCurrent
Short-term debt		5,000us-gaap_ShortTermBorrowings
Accounts payable	119,425us-gaap_AccountsPayableCurrent	167,988us-gaap_AccountsPayableCurrent
Customer deposits	72,372us-gaap_CustomerDepositsCurrent	71,546us-gaap_CustomerDepositsCurrent
Income taxes payable	14,341us-gaap_TaxesPayableCurrent
Accrued general taxes	61,819	44,339
Accrued interest	22,332us-gaap_InterestPayableCurrent	16,468us-gaap_InterestPayableCurrent
Deferred income taxes	16,299
Deferred purchased gas costs	390us-gaap_DeferredGasPurchasesCurrent
Other current liabilities	152,338us-gaap_OtherLiabilitiesCurrent	145,584us-gaap_OtherLiabilitiesCurrent
Total current liabilities	477,582us-gaap_LiabilitiesCurrent	470,117us-gaap_LiabilitiesCurrent
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits	721,924	723,688
Accumulated removal costs	309,000	304,000
Other deferred credits and other long-term liabilities	568,533	572,810
Total deferred income taxes and other credits	1,599,457us-gaap_OtherLiabilitiesNoncurrent	1,600,498us-gaap_OtherLiabilitiesNoncurrent
Total capitalization and liabilities	$ 5,154,397	$ 5,214,515

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