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UNIT-BASED COMPENSATION (Narrative) (Details) (USD $)
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12 Months Ended | 12 Months Ended | 12 Months Ended | 7 Months Ended | 12 Months Ended | 7 Months Ended | 12 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
Common Units
Long-term Incentive Plan
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Dec. 31, 2013
Phantom Units
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Dec. 31, 2012
Phantom Units
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Dec. 31, 2011
Phantom Units
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Dec. 31, 2013
Phantom Units
Granted in March 2013
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Dec. 31, 2013
Phantom Units
Granted in October 2012
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Apr. 30, 2013
DFW Net Profits Interests
holder
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Dec. 31, 2013
DFW Net Profits Interests
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Dec. 31, 2012
DFW Net Profits Interests
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May 01, 2013
DFW Net Profits Interests
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Apr. 30, 2013
SMLP Restricted Units
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Dec. 31, 2013
SMP Net Profits Interests
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Dec. 31, 2012
SMP Net Profits Interests
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Dec. 31, 2009
Maximum
DFW Net Profits Interests
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Dec. 31, 2009
Maximum
SMP Net Profits Interests
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||
| Units reserved for issuance pursuant to LTIP | 5,000,000.0 | |||||||||||||||||
| Units available for future issuance | 4,700,000 | |||||||||||||||||
| Award vesting period | 3 years | 5 years | ||||||||||||||||
| Unrecognized non-cash compensation expense | $ 3,600,000 | |||||||||||||||||
| Remaining expected weighted-average vesting period of recognition of incremental non-cash compensation expense | 2 years 7 months 31 days | |||||||||||||||||
| Units forfeited (in shares) | 4,041 | 0 | ||||||||||||||||
| Other disclosures | ||||||||||||||||||
| Portion of membership interests authorized for issuance, percent | 5.00% | 7.50% | ||||||||||||||||
| Number of holders of net profit interest | 7 | |||||||||||||||||
| Payment to acquire vested net profit interests | 11,957,000 | 0 | 0 | 12,200,000 | ||||||||||||||
| Restricted units exchanged for unvested net profit interests | 7,393 | |||||||||||||||||
| Nonvested phantom and restricted units (in shares) | 283,682 | 131,558 | 0 | 0 | ||||||||||||||
| Period of recognition of compensation expense | 4 years | |||||||||||||||||
| Non-cash compensation expense - prior periods (in dollars) | 600,000 | 500,000 | ||||||||||||||||
| Compensation expense due to modification | $ 1,400,000 | |||||||||||||||||
| Portion of membership interests issued, percent | 6.355% | |||||||||||||||||
| Portion of membership interests forfeited, percent | 0.00% | |||||||||||||||||