ORGANIZATION AND PRESENTATION (Details)	6 Months Ended
Jun. 30, 2013
Ownership interests
Ownership percentage by limited partners	100.00%
ARLP \| SGP
Ownership interests
Ownership percentage by noncontrolling owners	0.01%
MGP
Ownership interests
Subsidiaries holding percentage	100.00%
Intermediate Partnership \| SGP
Ownership interests
Ownership percentage by noncontrolling owners	0.01%

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The number of units or percentage investment held by one or more members or limited partners of the LLC or LP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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- Definition

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 22

-Article 12

+ Details

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