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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details) (USD $) | 6 Months Ended
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Jun. 30, 2014
Significant Accounting Policies [Line Items] |
Minimum likelihood of tax benefits being recognized upon ultimate settlement | 50.00%
Recognized interest income expense and penalties related to unrecognized tax benefits | $ 0
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | 350
Redemption Baskets [Member] |
Significant Accounting Policies [Line Items] |
Number of units per basket | 50,000
Maximum [Member] |
Significant Accounting Policies [Line Items] |
Cash equivalents maturity period | 6 months

X
- Definition Cash Equivalents, Maturity Period + References No definition available. + Details
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Namespace Prefix: | unl_
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Balance Type: | na
Period Type: | duration

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- Definition Fee Paid Per Order + References No definition available. + Details
Name: | unl_FeePaidPerOrder
Namespace Prefix: | unl_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of Units per Basket + References No definition available. + Details
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Namespace Prefix: | unl_
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Balance Type: | na
Period Type: | instant

X
- Definition Percentage of income tax examination minimum likelihood of tax benefits being realized upon settlement. + References No definition available. + Details
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Namespace Prefix: | unl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Recognized interest income expense and penalties related to unrecognized tax benefits. + References No definition available. + Details
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Namespace Prefix: | unl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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