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Document And Entity Information	6 Months Ended
	Jun. 30, 2013
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	UNL
Entity Common Stock, Shares Outstanding	0
Entity Registrant Name	United States 12 Month Natural Gas Fund, LP
Entity Central Index Key	0001405513
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer

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