Risk - Additional Information (Detail) |
6 Months Ended |
|---|---|
Jun. 30, 2018 | |
| 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 |
| UltraPro Fund and UltraPro Short Fund [Member] | |
| Unusual Risk or Uncertainty [Line Items] | |
| Leverage risk benchmark | 33% at any point in the day |