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PARTNERS' CAPITAL AND MEMBERSHIP INTERESTS (Tables)
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12 Months Ended |
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Dec. 31, 2013
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| Business Acquisition [Line Items] |
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| Schedule of Partner Units Activity |
A rollforward of the number of common limited partner, subordinated limited partner and general partner units follows. | | | | | | | | | | | | | | Common | | Subordinated | | General partner | | Total | Units, January 1, 2012 | — |
| | — |
| | — |
| | — |
| Units issued to the public in connection with the IPO | 14,380,000 |
| | — |
| | — |
| | 14,380,000 |
| Units issued to affiliates in connection with the IPO | 10,029,850 |
| | 24,409,850 |
| | 996,320 |
| | 35,436,020 |
| Units issued | 2,577 |
| | — |
| | — |
| | 2,577 |
| Units, December 31, 2012 | 24,412,427 |
| | 24,409,850 |
| | 996,320 |
| | 49,818,597 |
| Units issued to affiliates in connection with the Bison Drop Down | 1,553,849 |
| | — |
| | 31,711 |
| | 1,585,560 |
| Units issued to affiliates in connection with the Mountaineer Acquisition | 3,107,698 |
| | — |
| | 63,422 |
| | 3,171,120 |
| Units issued | 5,892 |
| | — |
| | — |
| | 5,892 |
| Units, December 31, 2013 | 29,079,866 |
| | 24,409,850 |
| | 1,091,453 |
| | 54,581,169 |
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| Schedule of partnership target distributions |
| | | | | | | | Total quarterly distribution per unit target amount | | Marginal percentage interest in distributions | | | Unitholders | | General partner | Minimum quarterly distribution | $0.40 | | 98.0% | | 2.0% | First target distribution | $0.40 up to $0.46 | | 98.0% | | 2.0% | Second target distribution | above $0.46 up to $0.50 | | 85.0% | | 15.0% | Third target distribution | above $0.50 up to $0.60 | | 75.0% | | 25.0% | Thereafter | above $0.60 | | 50.0% | | 50.0% |
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| Details of Cash Distributions |
Details of cash distributions declared follow. | | | | | | | | | | | | | | | | | | | | | | | | Attributable to the quarter ended | | Payment date | | Per-unit distribution | | Cash paid (or payable) to common unitholders | | Cash paid (or payable) to subordinated unitholders | | Cash paid (or payable) to general partner (1) | | Total distribution | | | | | (Dollars in thousands, except per-unit amounts) | December 31, 2012 | | February 14, 2013 | | $ | 0.4100 |
| | $ | 10,009 |
| | $ | 10,008 |
| | $ | 408 |
| | $ | 20,425 |
| March 31, 2013 | | May 15, 2013 | | 0.4200 |
| | 10,253 |
| | 10,252 |
| | 418 |
| | 20,923 |
| June 30, 2013 | | August 14, 2013 | | 0.4350 |
| | 12,647 |
| | 10,618 |
| | 475 |
| | 23,740 |
| September 30, 2013 | | November 14, 2013 | | 0.4600 |
| | 13,377 |
| | 11,229 |
| | 502 |
| | 25,108 |
| December 31, 2013 | | February 14, 2014 | | 0.4800 |
| | 13,958 |
| | 11,717 |
| | 691 |
| | 26,366 |
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__________ (1) Distributions attributable to the quarter ended December 31, 2013 include payments associated with the general partner's IDRs, which totaled $163,000. Our general partner was not entitled to receive incentive distributions for periods prior to the fourth quarter of 2013 based on the amount of the distributions declared per common and subordinated unit. |
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Bison Midstream
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| Business Acquisition [Line Items] |
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| Schedule of Business Acquisition |
In exchange for its $305.4 million net investment in Bison Midstream, SMLP paid SMP Holdings and the general partner total cash and unit consideration of $248.9 million. As a result of the contribution of net assets in excess of consideration, SMLP recognized a capital contribution from SMP Holdings. The details of total cash and unit consideration as well as the calculation of the capital contribution and its allocation to partners' capital follow (dollars in thousands). | | | | | | | | | SMP Holdings' net investment in Bison Midstream | | | $ | 305,449 |
| Aggregate cash paid to SMP Holdings | $ | 200,000 |
| | | Issuance of 1,553,849 SMLP common units to SMP Holdings | 47,936 |
| | | Issuance of 31,711 SMLP general partner units to the general partner | 978 |
| | | Total consideration | | | 248,914 |
| SMP Holdings' contribution of net assets in excess of consideration | | | $ | 56,535 |
| | | | | Allocation of capital contribution: | | | | General partner interest | $ | 1,131 |
| | | Common limited partner interest | 28,558 |
| | | Subordinated limited partner interest | 26,846 |
| | | Partners' capital allocation | | | $ | 56,535 |
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The fair values of the assets acquired and liabilities assumed as of February 15, 2013, were as follows (in thousands): | | | | | | | | | Purchase price assigned to Bison Gas Gathering system | | | $ | 303,168 |
| Current assets | $ | 5,705 |
| | | Property, plant, and equipment | 85,477 |
| | | Intangible assets | 164,502 |
| | | Other noncurrent assets | 2,187 |
| | | Total assets acquired | 257,871 |
| | | Current liabilities | 6,112 |
| | | Other noncurrent liabilities | 2,790 |
| | | Total liabilities assumed | $ | 8,902 |
| | | Net identifiable assets acquired | | | 248,969 |
| Goodwill | | | $ | 54,199 |
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Mountaineer Midstream
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| Business Acquisition [Line Items] |
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| Schedule of Business Acquisition |
The allocation and valuation of units issued to SMP Holdings and the general partner to partially fund the Mountaineer Acquisition follow (dollars in thousands). | | | | | Issuance of 3,107,698 SMLP common units to SMP Holdings | $ | 98,000 |
| Issuance of 63,422 SMLP general partner units to the general partner | 2,000 |
| Issuance of units in connection with the Mountaineer Acquisition | $ | 100,000 |
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The final fair values of the assets acquired and liabilities assumed as of June 21, 2013, were as follows (in thousands): | | | | | | | | | Purchase price assigned to Mountaineer Midstream | | | $ | 210,000 |
| Property, plant, and equipment | $ | 163,661 |
| | | Gas gathering agreement contract intangibles | 24,019 |
| | | Rights-of-way | 6,109 |
| | | Total assets acquired | 193,789 |
| | | Total liabilities assumed | $ | — |
| | | Net identifiable assets acquired | | | 193,789 |
| Goodwill | | | $ | 16,211 |
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