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COMMITMENTS AND CONTINGENT LIABILITIES - SCHEDULE OF FUTURE COMMITTED EXPENSES (Details) - Jun. 30, 2015 - USD ($) $ in Thousands | Total
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Long-term Purchase Commitment [Line Items] |  |
Current charges recoverable through BGSS |  | $ 20,000
Natural Gas Purchases and Future Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 | [1] | 178,811
2016 | [1] | 413,613
2017 | [1] | 207,846
2018 | [1] | 176,655
2019 | [1] | 163,047
Thereafter | [1] | 1,059,058
NJRES [Member] | Natural Gas Purchases [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 |  | 114,201
2016 |  | 147,187
2017 |  | 4,811
2018 |  | 0
2019 |  | 0
Thereafter |  | 0
NJRES [Member] | Storage Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 |  | 8,761
2016 |  | 25,415
2017 |  | 10,945
2018 |  | 6,942
2019 |  | 4,202
Thereafter |  | 7,179
NJRES [Member] | Pipeline Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 |  | 23,176
2016 |  | 59,397
2017 |  | 32,485
2018 |  | 15,393
2019 |  | 7,523
Thereafter |  | 8,157
NJRES [Member] | Natural Gas Purchases and Future Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 |  | 146,138
2016 |  | 231,999
2017 |  | 48,241
2018 |  | 22,335
2019 |  | 11,725
Thereafter |  | $ 15,336
NJRES [Member] | Minimum [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Storage and pipeline capacity, contract term |  | 1 year
NJRES [Member] | Maximum [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Storage and pipeline capacity, contract term |  | 10 years
NJNG [Member] | Natural Gas Purchases [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 |  | $ 12,662
2016 |  | 72,705
2017 |  | 79,911
2018 |  | 49,492
2019 |  | 50,008
Thereafter |  | 165,917
NJNG [Member] | Storage Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 |  | 7,205
2016 |  | 29,032
2017 |  | 25,336
2018 |  | 15,872
2019 |  | 11,079
Thereafter |  | 5,345
NJNG [Member] | Pipeline Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 |  | 12,806
2016 |  | 79,877
2017 |  | 54,358
2018 |  | 88,956
2019 |  | 90,235
Thereafter |  | 872,460
NJNG [Member] | Natural Gas Purchases and Future Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 |  | 32,673
2016 |  | 181,614
2017 |  | 159,605
2018 |  | 154,320
2019 |  | 151,322
Thereafter |  | $ 1,043,722
[1] | Does not include amounts related to intercompany asset management agreements between NJRES and NJNG.

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- Definition Minimum amount of other commitment maturing in the fifth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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