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Condensed Statements of Financial Condition (USD $) | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Assets |  |
Cash and cash equivalents (Note 5) | $ 136,449,005 | $ 123,736,412
Equity in UBS Securities LLC trading accounts: |  |
Cash and cash equivalents | 24,291,380 | 42,136,549
Unrealized gain on open commodity futures contracts | 11,303,840 | 4,002,120
Dividend receivable | 2,352 | 1,916
Interest receivable | 49 | 14
Other assets | 133,640 | 127,440
Total assets | 172,180,266 | 170,004,451
Liabilities and Partners' Capital |  |
Investment payable |  | 33
Professional fees payable | 283,535 | 407,121
General Partner management fees payable (Note 3) | 89,360 | 88,691
Brokerage commissions payable | 6,022 | 6,022
Other liabilities | 19,659 | 12,704
Total liabilities | 398,576 | 514,571
Commitments and Contingencies (Notes 3, 4, and 5) |  |
Partners' Capital |  |
General Partner |  |
Limited Partners | 171,781,690 | 169,489,880
Total Partners' Capital | 171,781,690 | 169,489,880
Total liabilities and partners' capital | $ 172,180,266 | $ 170,004,451
Limited Partners' units outstanding | 3,750,000 | 3,900,000
Net asset value per unit | $ 45.81 | $ 43.46
Market value per unit | $ 45.81 | $ 43.48

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- Definition Unrealized gain (loss) on open commodity futures contracts. + References No definition available. + Details
Name: | usl_UnrealizedGainLossOnOpenCommodityFuturesContracts
Namespace Prefix: | usl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant