XML 20 R25.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Contracts and Agreements (Additional Information) (Details) (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Annual Fee for transfer agency services | $ 20,000 |
Ratio of expense to Average Net Assets | 0.01% | 0.01%
Maximum |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Transaction fees per transaction | 15 |
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts | 15 |
Minimum |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Annual Fee for transfer agency services | 75,000 |
Transaction fees per transaction | 7 |
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts | 7 |
First $500 million of USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Fee percentage | 0.06% |
First $500 million of USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets | Maximum |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Base amount for determining fee percentage | 500,000,000 |
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Fee percentage | 0.0465% |
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion | Maximum |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Base amount for determining fee percentage | 1,000,000,000 |
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion | Minimum |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Base amount for determining fee percentage | 500,000,000 |
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets exceed $1 billion |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Fee percentage | 0.035% |
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets exceed $1 billion | Maximum |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Base amount for determining fee percentage | 1,000,000,000 |
Marketing Agreement | USL's assets up to $3 billion |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Fee percentage | 0.06% |
Marketing Agreement | USL's assets up to $3 billion | Maximum |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Base amount for determining fee percentage | 3,000,000,000 |
Marketing Agreement | USL's assets in excess of $3 billion |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Fee percentage | 0.04% |
Marketing Agreement | USL's assets in excess of $3 billion | Minimum |  |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |  |
Base amount for determining fee percentage | $ 3,000,000,000 |

X
- Details
Name: | us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fees paid to an agent employed by a corporation or mutual fund to maintain shareholder records, including purchases, sales, and account balances. Also includes custodian fees incurred during an accounting period from an agent, bank, trust company, or other organization that holds and safeguards an individual's, mutual fund's, or investment company's assets for them. These fees will be billed back to the client and are a component of noninterest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_NoninterestExpenseTransferAgentAndCustodianFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Base Fee Percentage + References No definition available. + Details
Name: | usl_BaseFeePercentage
Namespace Prefix: | usl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Basis Amount for Fee Percentage + References No definition available. + Details
Name: | usl_BasisAmountForFeePercentage
Namespace Prefix: | usl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commissions Paid + References No definition available. + Details
Name: | usl_CommissionsPaid
Namespace Prefix: | usl_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ratio Of Expenses To Average Net Assets + References No definition available. + Details
Name: | usl_RatioOfExpensesToAverageNetAssets
Namespace Prefix: | usl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Transaction Fees Paid. + References No definition available. + Details
Name: | usl_TransactionFeesPaidPerTransaction
Namespace Prefix: | usl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration