XML 35 R4.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Condensed Schedule of Investments (Parenthetical) | 9 Months Ended
--- | ---
Sep. 30, 2015 USD ($)
Collateral Amount On Open Futures Contracts | $ 21,063,388
United States | US Treasury Securities | Cash Equivalents | U.S. Treasury Bills 0.10%, 10/01/2015 |
Interest rate | 0.10%
Expiration date | 10/1/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.08%, 10/08/2015 |
Interest rate | 0.08%
Expiration date | 10/8/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.07%, 10/15/2015 |
Interest rate | 0.07%
Expiration date | 10/15/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.09%, 10/22/2015 |
Interest rate | 0.09%
Expiration date | 10/22/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.06%, 10/29/2015 |
Interest rate | 0.06%
Expiration date | 10/29/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.07%, 11/05/2015 |
Interest rate | 0.07%
Expiration date | 11/5/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.08%, 11/12/2015 |
Interest rate | 0.08%
Expiration date | 11/12/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.08%, 11/19/2015 |
Interest rate | 0.08%
Expiration date | 11/19/2015
United States | US Treasury Securities | Cash Equivalents | Us Treasury Bills Securities 9 [Member] |
Interest rate | 0.09%
Expiration date | 11/27/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.09%, 12/24/2015 |
Interest rate | 0.09%
Expiration date | 12/24/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.11%, 12/31/2015 |
Interest rate | 0.11%
Expiration date | 12/31/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.13%, 1/21/2016 |
Interest rate | 0.13%
Expiration date | 1/21/2016
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.15%, 1/28/2016 |
Interest rate | 0.15%
Expiration date | 1/28/2016
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.19%, 2/04/2016 |
Interest rate | 0.19%
Expiration date | 2/4/2016
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.22%, 2/11/2016 |
Interest rate | 0.22%
Expiration date | 2/11/2016
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.20%, 2/18/2016 |
Interest rate | 0.20%
Expiration date | 2/18/2016
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.20%, 2/25/2016 |
Interest rate | 0.20%
Expiration date | 2/25/2016
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.23%, 3/03/2016 |
Interest rate | 0.23%
Expiration date | 3/3/2016
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.26%, 3/10/2016 |
Interest rate | 0.26%
Expiration date | 3/10/2016
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.24%, 3/17/2016 |
Interest rate | 0.24%
Expiration date | 3/17/2016
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.09%, 3/24/2016 |
Interest rate | 0.09%
Expiration date | 3/24/2016

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The list of dates or date range within which the options may be exercised of the investment subject to option. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.4(b)) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13.5(d)) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010 + Details
Name: | us-gaap_InvestmentOwnedSubjectToOptionExerciseDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The collateral amount on open future contracts. + References No definition available. + Details
Name: | usl_CollateralAmountOnOpenFuturesContracts
Namespace Prefix: | usl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentSecuritiesClassAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentAxis=us-gaap_CashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities4Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities5Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities6Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities7Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities8Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities9Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities10Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities12Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities13Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities14Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities15Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities16Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities17Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities18Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities19Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities20Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities21Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=usl_UsTreasuryBillsSecurities22Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |