SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details) |
Dec. 31, 2016
$ / Units
|
|---|---|
| Significant Accounting Policies [Line Items] | |
| Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | 350 |
| Creation Baskets | |
| Significant Accounting Policies [Line Items] | |
| Number of Shares per basket | 50,000 |
| Prior to July 1, 2011 | |
| Significant Accounting Policies [Line Items] | |
| Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | 1,000 |