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PARTNERS' CAPITAL AND MEMBERSHIP INTERESTS (Mountaineer Acquisition) (Details) (Mountaineer Midstream, USD $)
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0 Months Ended | 12 Months Ended | |
|---|---|---|---|
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Jun. 21, 2013
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Jun. 03, 2013
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Dec. 31, 2013
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| Business Acquisition [Line Items] | |||
| Cost of acquired entity, purchase price | $ 210,000,000 | ||
| Cost of acquired entity, cash paid | 110,000,000 | ||
| Units issued to acquire entity | 100,000,000 | 100,000,000 | |
| Volume weighted average share price, term | 5 days | ||
| Volume weighted average share price | $ 31.53 | ||
| Units issued in connection with acquisition | 3,171,120.00 | ||
| Cost of acquired entity, equity interests issued and issuable | 100,000,000 | ||
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Limited partners, Common
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| Business Acquisition [Line Items] | |||
| Units issued to acquire entity | 98,000,000 | 98,000,000 | |
| Units issued in connection with acquisition | 3,107,698 | 3,107,698 | |
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General Partner Units
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| Business Acquisition [Line Items] | |||
| Units issued to acquire entity | $ 2,000,000 | ||
| Units issued in connection with acquisition | 63,422 | 63,422 | |