|
Risk - Additional Information (Detail)
|
3 Months Ended |
|---|---|
|
Mar. 31, 2013
|
|
| Unusual Risk or Uncertainty [Line Items] | |
| Percentage of calculation on simple inverse correlation | 200.00% |
|
UltraShort Fund [Member]
|
|
| Unusual Risk or Uncertainty [Line Items] | |
| Leverage risk benchmark | 50% at any point in the day |
|
Swap agreements or forward contracts [Member]
|
|
| Unusual Risk or Uncertainty [Line Items] | |
| Exposure to swap agreements or forward contracts | 100.00% |