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RELATED PARTY TRANSACTIONS (Details) (USD $)
 3 Months Ended 3 Months Ended 39 Months Ended 3 Months Ended 3 Months Ended
Dec. 31, 2013
NJRES to Steckman RIdge and Iroquios Affliates [Member]
Dec. 31, 2012
NJRES to Steckman RIdge and Iroquios Affliates [Member]
Dec. 31, 2013
NJRES to Steckman Ridge Affiliate
Sep. 30, 2013
NJRES to Steckman Ridge Affiliate
Dec. 31, 2013
NJRES to Iroquois Affiliate [Member]
Sep. 30, 2013
NJRES to Iroquois Affiliate [Member]
Dec. 31, 2013
NJNG to Steckman RIdge Affiliate
MMcf
Jun. 30, 2013
NJNG to Steckman RIdge Affiliate
Sep. 30, 2013
NJNG to Steckman RIdge Affiliate
Dec. 31, 2013
NJNG to Steckman RIdge and Iroquios Affiliates [Member]
Dec. 31, 2012
NJNG to Steckman RIdge and Iroquios Affiliates [Member]
Dec. 31, 2013
NJNG to Iroquois Affiliate [Member]
Sep. 30, 2013
NJNG to Iroquois Affiliate [Member]
Dec. 31, 2013
NJNG to NJRES Affiliate [Member]
MMcf
Related Party Transaction [Line Items]                            
Demand fees expense recognized pertaining to related party agreement $ 1,600,000 $ 1,600,000               $ 1,700,000 $ 1,400,000      
Due to related parties     143,000 159,000 392,000 390,000 776,000   775,000     61,000 61,000  
Related party agreement term               10 years            
Agreement for natural gas storage capacity between NJNG and affiliate (MMcf)             3,000              
Approximate annual demand fees under agreement from April 1 2010 to March 31 2020             $ 9,300,000              
Natural gas sold at cost under asset management agreement (MMcf)                           1,000