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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fees Paid and Related Party Transactions [Line Items]
Percentage of Management Fee in Average Daily Total Net Assets	0.60%
Licensing fee incurred	$ 8,433	$ 11,830	$ 16,158
Investor tax reporting cost	131,500	144,700	153,000
Directors' fees and expenses	13,028	13,806	14,120
USL and the Related Public Funds, other than USCI, USAG, CPER and USMI
Fees Paid and Related Party Transactions [Line Items]
Directors' fees and expenses	$ 556,951	521,689	536,375
On and after October 20, 2011
Fees Paid and Related Party Transactions [Line Items]
Fee percentage	0.015%
USL's
Fees Paid and Related Party Transactions [Line Items]
Investor tax reporting cost	$ 13,028	$ 13,806	$ 14,120

X

- Definition

Noninterest expense related to directors' fees which are fees paid by an Entity to its directors. Directors' fees may be paid in addition to salary and other benefits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14)
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of general expenses not normally included in Other Operating Costs and Expenses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.6)
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Base Fee Percentage

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Fees Paid and Related Party Transactions [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	usl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

It represent the value of license fees and other offering expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	usl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of Management Fee In Average Daily Total Net Assets.

+ References

No definition available.

+ Details

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- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=usl_UnitedStatesTwelveMonthOilFundLimitedPartnershipMemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: