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Contracts and Agreements - Additional Information (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Annual transfer agency services fee |
$ 20,000 |
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| Brokerage commissions |
39,110 |
63,245 |
81,427 |
| Annualized percentage of average daily total net assets |
0.07% |
0.07% |
0.07% |
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Rebalancing Investments Transaction
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
37,933 |
58,167 |
76,347 |
| Brokerage commissions percentage |
96.99% |
91.79% |
93.76% |
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Trades Necessitated By Creation And Redemption Activity
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
1,177 |
5,078 |
5,080 |
| Brokerage commissions percentage |
3.01% |
8.03% |
6.24% |
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Maximum
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Transaction fees per transaction |
15 |
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| Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts |
15 |
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Minimum
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Annual Fee for custody, fund accounting and fund administration services |
75,000 |
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| Transaction fees per transaction |
7 |
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| Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts |
7 |
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First $500 million of the Related Public Funds’ combined net assets
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Fee percentage |
0.06% |
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First $500 million of the Related Public Funds’ combined net assets | Maximum
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Base amount for determining fee percentage |
500,000,000 |
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Related Public Funds’ combined net assets greater than $500 million but less than $1 billion
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Fee percentage |
0.0465% |
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Related Public Funds’ combined net assets greater than $500 million but less than $1 billion | Maximum
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Base amount for determining fee percentage |
1,000,000,000 |
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Related Public Funds’ combined net assets greater than $500 million but less than $1 billion | Minimum
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Base amount for determining fee percentage |
500,000,000 |
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Related Public Funds’ combined net assets exceed $1 billion
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Fee percentage |
0.035% |
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Related Public Funds’ combined net assets exceed $1 billion | Minimum
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Base amount for determining fee percentage |
1,000,000,000 |
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Marketing Agreement | Assets up to $3 billion
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Fee percentage |
0.06% |
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Marketing Agreement | Assets up to $3 billion | Maximum
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Base amount for determining fee percentage |
3,000,000,000 |
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Marketing Agreement | Assets in excess of $3 billion
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Fee percentage |
0.04% |
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Marketing Agreement | Assets in excess of $3 billion | Minimum
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Base amount for determining fee percentage |
$ 3,000,000,000 |
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