FAIR VALUE OF FINANCIAL INSTRUMENTS (Valuation of Securities Using Fair Value Hierarchy) (Details) - USD ($)
|
Dec. 31, 2016 |
Dec. 31, 2015 |
| United States Commodity Index Fund [Member] | Short-Term Investments [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
$ 514,192,445
|
$ 299,704,608
|
| United States Commodity Index Fund [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
(3,366,242)
|
(4,020,212)
|
| United States Commodity Index Fund [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
5,421,702
|
(4,562,015)
|
| United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Short-Term Investments [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
514,192,445
|
299,704,608
|
| United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
(3,366,242)
|
(4,020,212)
|
| United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
5,421,702
|
(4,562,015)
|
| United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Short-Term Investments [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Copper Index Fund [Member] | Short-Term Investments [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
4,541,320
|
998,899
|
| United States Copper Index Fund [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
88,575
|
(180,625)
|
| United States Copper Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Short-Term Investments [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
4,541,320
|
998,899
|
| United States Copper Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
88,575
|
(180,625)
|
| United States Copper Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Copper Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Copper Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Short-Term Investments [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Copper Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Agriculture Index Fund [Member] | Short-Term Investments [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
1,397,843
|
749,059
|
| United States Agriculture Index Fund [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
(90,442)
|
48,270
|
| United States Agriculture Index Fund [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
742
|
(42,113)
|
| United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Short-Term Investments [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
1,397,843
|
749,059
|
| United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
(90,442)
|
48,270
|
| United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
742
|
(42,113)
|
| United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Short-Term Investments [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
0
|
0
|
| United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member] |
|
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] |
|
|
| Securities, fair value |
$ 0
|
$ 0
|