XML 45 R27.htm IDEA: XBRL DOCUMENT
v3.3.1.900

CONTRACTS AND AGREEMENTS (Brokerage Commissions) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Floor Brokerage Exchange and Clearance Fees | $ 6,117 | $ 3,918 | $ 8,360
Percentage Of Average Daily Net Assets | 0.04% | 0.02% | 0.03%
Rebalancing Investments Transaction [Member] |  |  |
Floor Brokerage Exchange and Clearance Fees | $ 4,698 | $ 2,126 | $ 4,484
Percentage Of Average Daily Net Assets | 76.80% | 54.26% | 53.64%
Creation And Redemption Activity [Member] |  |  |
Floor Brokerage Exchange and Clearance Fees | $ 1,419 | $ 1,792 | $ 3,876
Percentage Of Average Daily Net Assets | 23.20% | 45.74% | 46.36%

X
- Definition Percentage of Average Daily Net Assets + References No definition available. + Details
Name: | unl_PercentageOfAverageDailyNetAssets
Namespace Prefix: | unl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees. + References No definition available. + Details
Name: | us-gaap_FloorBrokerageExchangeAndClearanceFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=unl_RebalancingInvestmentsTransactionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=unl_CreationAndRedemptionActivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |