ORGANIZATION AND PRESENTATION (Details)	3 Months Ended
Mar. 31, 2017
Ownership interests
Ownership percentage by limited partners	100.00%
MGP
Ownership interests
Subsidiaries holding percentage	100.00%
ARLP \| SGP
Ownership interests
Ownership percentage by noncontrolling owners	0.01%
Intermediate Partnership \| SGP
Ownership interests
Ownership percentage by noncontrolling owners	0.01%

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- Definition

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.

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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 FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611443-123010

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