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Risk - Additional Information (Detail)
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6 Months Ended |
|---|---|
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Jun. 30, 2014
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| Unusual Risk or Uncertainty [Line Items] | |
| Percentage of calculation on simple inverse correlation | 200.00% |
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UltraShort Fund [Member]
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| Unusual Risk or Uncertainty [Line Items] | |
| Leverage risk benchmark | 50% at any point in the day |
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Forward Agreements [Member]
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| Unusual Risk or Uncertainty [Line Items] | |
| Exposure to swap agreements or forward contracts | 100.00% |