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RELATED-PARTY TRANSACTIONS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Related Party Transaction [Line Items]    
Operating Revenues/Affiliates $ 1,284us-gaap_RevenueFromRelatedParties $ 491us-gaap_RevenueFromRelatedParties
Operations Expense/Affiliates 4,468us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty 4,534us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
SJRG    
Related Party Transaction [Line Items]    
Operating Revenues/Affiliates 1,052us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_SouthJerseyResourceGroupMember
158us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_SouthJerseyResourceGroupMember
Costs of Sales/Affiliates (Excluding depreciation) 19,023us-gaap_RelatedPartiesAmountInCostOfSales
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_SouthJerseyResourceGroupMember
5,484us-gaap_RelatedPartiesAmountInCostOfSales
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_SouthJerseyResourceGroupMember
Energy-Related Derivative (Gains) / Losses (4)sji_RelatedPartyTransactionEnergyRelatedDerivativeGainsLosses
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_SouthJerseyResourceGroupMember
[1] (1,030)sji_RelatedPartyTransactionEnergyRelatedDerivativeGainsLosses
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_SouthJerseyResourceGroupMember
[1]
Marina    
Related Party Transaction [Line Items]    
Operating Revenues/Affiliates 232us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_MarinaEnergyLlcMember
333us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_MarinaEnergyLlcMember
SJI    
Related Party Transaction [Line Items]    
Operations Expense/Affiliates 3,917us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_SouthJerseyIndustriesIncMember
4,030us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_SouthJerseyIndustriesIncMember
Millennium    
Related Party Transaction [Line Items]    
Operations Expense/Affiliates 660us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_MillenniumAccountServicesMember
608us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_MillenniumAccountServicesMember
Other    
Related Party Transaction [Line Items]    
Operations Expense/Affiliates $ (109)us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_OtherRelatedPartiesMember
$ (104)us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sji_OtherRelatedPartiesMember
[1] Contracts used to hedge natural gas purchases. Included in Cost of Sales on the Condensed Statement of Income.