Schedule of Investments (Parenthetical) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
United States Commodity Index Fund [Member]    
Debt Instrument, Collateral Amount $ 40,050,520 $ 55,991,723
Interest rate 0.005% 0.005%
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | LME Tin Futures LT January 2017 contracts, expiring January 2017 [Member]    
Expiration date January 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | ICE-US Cocoa Futures CC March 2017 contracts, expiring March 2017 [Member]    
Expiration date March 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | LME Zinc Futures LX April 2017 contracts, expiring April 2017 [Member]    
Expiration date April 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | ICE-US Sugar 11 Futures SB May 2017 contracts, expiring April 2017 [Member]    
Expiration date April 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | LME Lead Futures LL May 2017 contracts, expiring May 2017 [Member]    
Expiration date May 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Lme Aluminum Futures La January 2017 Contracts, Expiring January 2017 [Member]    
Expiration date January 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Lme Aluminum Futures La February 2017 Contracts, Expiring February 2017 [Member]    
Expiration date February 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Lme Tin Futures Lt February 2017 Contracts, Expiring February 2017 [Member]    
Expiration date February 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Lme Nickel Futures Ln July 2017 Contracts, Expiring July 2017 [Member]    
Expiration date July 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Ice Brent Crude Oil Futures Co December 2017 Contracts, Expiring October 2017 [Member]    
Expiration date October 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Ice Us Gas Oil Futures Qs December 2017 Contracts, Expiring December 2017 [Member]    
Expiration date December 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Lme Lead Futures Ll January 2016 Contracts, Expiring January 2016 [Member]    
Expiration date   January 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Lme Tin Futures Lt February 2016 Contracts, Expiring February 2016 [Member]    
Expiration date   February 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Lme Zinc Futures Lx February 2016 Contracts, Expiring February 2016 [Member]    
Expiration date   February 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Ice-Us Cotton 2 Futures Ct March 2016 Contracts, Expiring March 2016 [Member]    
Expiration date   March 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Lme Aluminum Futures La March 2016 Contracts, Expiring March 2016 [Member]    
Expiration date   March 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Ice-Us Sugar 11 Futures Sb May 2016 Contracts, Expiring April 2016 [Member]    
Expiration date   April 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Lme Lead Futures Ll May 2016 Contracts, Expiring May 2016 [Member]    
Expiration date   May 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | Ice-Us Cocoa Futures Cc July 2016 Contracts, Expiring July 2016 [Member]    
Expiration date   July 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CME Feeder Cattle Futures FC March 2017 contracts, expiring March 2017 [Member]    
Expiration date March 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CBOT Soybean Oil Futures BO March 2017 contracts, expiring March 2017 [Member]    
Expiration date March 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | COMEX Copper Futures HG March 2017 contracts, expiring March 2017 [Member]    
Expiration date March 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Comex Gold Futures Gc April 2017 Contracts, Expiring April 2017 [Member]    
Expiration date April 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Nymex Natural Gas Futures Ng October 2017 Contracts, Expiring September 2017 [Member]    
Expiration date September 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Nymex Wti Crude Oil Futures Cl December 2017 Contracts, Expiring November 2017 [Member]    
Expiration date November 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Nymex Heating Oil Futures Ho December 2017 Contracts, Expiring November 2017 [Member]    
Expiration date November 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Cbot Corn Futures C March 2016 Contracts, Expiring March 2016 [Member]    
Expiration date   March 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Cbot Soybean Futures S March 2016 Contracts, Expiring March 2016 [Member]    
Expiration date   March 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Cme Feeder Cattle Futures Lc March 2016 Contracts, Expiring March 2016 [Member]    
Expiration date   March 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Comex Silver Futures Si March 2016 Contracts, Expiring March 2016 [Member]    
Expiration date   March 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Cme Live Cattle Futures Lc April 2016 Contracts, Expiring April 2016 [Member]    
Expiration date   April 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Comex Gold Futures Gc April 2016 Contracts, Expiring April 2016 [Member]    
Expiration date   April 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Cbot Soybean Oil Futures Bo July 2016, Expiring July 2016 [Member]    
Expiration date   July 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Nymex Rbob Gasoline Futures Rb December 2016, Expiring November 2016 [Member]    
Expiration date   November 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Short [Member] | Foreign [Member] | LME Tin Futures LT January 2017 contracts, expiring January 2017 [Member]    
Expiration date January 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Short [Member] | Foreign [Member] | LME Zinc Futures LX April 2017 contracts, expiring April 2017 [Member]    
Expiration date April 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Short [Member] | Foreign [Member] | LME Lead Futures LL May 2017 contracts, expiring May 2017 [Member]    
Expiration date May 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Short [Member] | Foreign [Member] | Lme Aluminum Futures La January 2017 Contracts, Expiring January 2017 [Member]    
Expiration date January 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Short [Member] | Foreign [Member] | Lme Nickel Futures Ln July 2017 Contracts, Expiring July 2017 [Member]    
Expiration date July 2017  
United States Commodity Index Fund [Member] | Open Futures Contracts Short [Member] | Foreign [Member] | Lme Lead Futures Ll January 2016 Contracts, Expiring January 2016 [Member]    
Expiration date   January 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Short [Member] | Foreign [Member] | Lme Tin Futures Lt February 2016 Contracts, Expiring February 2016 [Member]    
Expiration date   February 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Short [Member] | Foreign [Member] | Lme Zinc Futures Lx February 2016 Contracts, Expiring February 2016 [Member]    
Expiration date   February 2016
United States Commodity Index Fund [Member] | Open Futures Contracts Short [Member] | Foreign [Member] | Lme Lead Futures Ll May 2016 Contracts, Expiring May 2016 [Member]    
Expiration date   May 2016
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.34%, 1/05/2017 [Member]    
Expiration date 1/05/2017  
Interest rate 0.34%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.38%, 1/12/2017 [Member]    
Expiration date 1/12/2017  
Interest rate 0.38%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.43%, 1/19/2017 [Member]    
Expiration date 1/19/2017  
Interest rate 0.43%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.36%, 1/26/2017 [Member]    
Expiration date 1/26/2017  
Interest rate 0.36%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.45%, 2/16/2017 [Member]    
Expiration date 2/16/2017  
Interest rate 0.45%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.45%, 3/02/2017 [Member]    
Expiration date 3/02/2017  
Interest rate 0.45%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.47%, 3/09/2017 [Member]    
Expiration date 3/09/2017  
Interest rate 0.47%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.43%, 3/30/2017 [Member]    
Expiration date 3/30/2017  
Interest rate 0.43%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.47%, 4/13/2017 [Member]    
Expiration date 4/13/2017  
Interest rate 0.47%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.46%, 4/20/2017 [Member]    
Expiration date 4/20/2017  
Interest rate 0.46%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.47%, 4/27/2017 [Member]    
Expiration date 4/27/2017  
Interest rate 0.47%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.49%, 5/04/2017 [Member]    
Expiration date 5/04/2017  
Interest rate 0.49%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.55%, 5/11/2017 [Member]    
Expiration date 5/11/2017  
Interest rate 0.55%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.60%, 5/18/2017 [Member]    
Expiration date 5/18/2017  
Interest rate 0.60%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.61%, 5/25/2017 [Member]    
Expiration date 5/25/2017  
Interest rate 0.61%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.60%, 6/01/2017 [Member]    
Expiration date 6/01/2017  
Interest rate 0.60%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.62%, 6/08/2017 [Member]    
Expiration date 6/08/2017  
Interest rate 0.62%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.65%, 6/15/2017 [Member]    
Expiration date 6/15/2017  
Interest rate 0.65%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.64%, 6/22/2017 [Member]    
Expiration date 6/22/2017  
Interest rate 0.64%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.60%, 6/29/2017 [Member]    
Expiration date 6/29/2017  
Interest rate 0.60%  
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.10%, 1/14/2016 [Member]    
Expiration date   1/14/2016
Interest rate   0.10%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.23%, 3/03/2016 [Member]    
Expiration date   3/03/2016
Interest rate   0.23%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.26%, 3/31/2016 [Member]    
Expiration date   3/31/2016
Interest rate   0.26%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.26%, 5/05/2016 [Member]    
Expiration date   5/05/2016
Interest rate   0.26%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.33%, 5/12/2016 [Member]    
Expiration date   5/12/2016
Interest rate   0.33%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.35%, 5/26/2016 [Member]    
Expiration date   5/26/2016
Interest rate   0.35%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.53%, 6/09/2016 [Member]    
Expiration date   6/09/2016
Interest rate   0.53%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.46%, 6/23/2016 [Member]    
Expiration date   6/23/2016
Interest rate   0.46%
United States Copper Index Fund [Member]    
Debt Instrument, Collateral Amount $ 253,165 $ 433,440
United States Copper Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | COMEX Copper Futures HG March 2017 contracts, expiring March 2017 [Member]    
Expiration date March 2017  
United States Copper Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | COMEX Copper Futures HG March 2016 contracts, expiring March 2016 [Member]    
Expiration date   March 2016
United States Copper Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | COMEX Copper Futures HG May 2017 contracts, expiring May 2017 [Member]    
Expiration date May 2017  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Expiration date 5/11/2017  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.34%, 1/05/2017 [Member]    
Expiration date 1/05/2017  
Interest rate 0.34%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.44%, 1/26/2017 [Member]    
Expiration date 1/26/2017  
Interest rate 0.44%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.46%, 2/16/2017 [Member]    
Expiration date 2/16/2017  
Interest rate 0.46%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.48%, 3/09/2017 [Member]    
Expiration date 3/09/2017  
Interest rate 0.48%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.46%, 4/06/2017 [Member]    
Expiration date 4/06/2017  
Interest rate 0.46%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.47%, 4/13/2017 [Member]    
Expiration date 4/13/2017  
Interest rate 0.47%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.46%, 4/20/2017 [Member]    
Expiration date 4/20/2017  
Interest rate 0.46%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.47%, 4/27/2017 [Member]    
Expiration date 4/27/2017  
Interest rate 0.47%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.49%, 5/04/2017 [Member]    
Expiration date 5/04/2017  
Interest rate 0.49%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.60%, 5/18/2017 [Member]    
Expiration date 5/18/2017  
Interest rate 0.60%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.60%, 6/01/2017 [Member]    
Expiration date 6/01/2017  
Interest rate 0.60%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.62%, 6/08/2017 [Member]    
Expiration date 6/08/2017  
Interest rate 0.62%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.65%, 6/15/2017 [Member]    
Expiration date 6/15/2017  
Interest rate 0.65%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.64%, 6/22/2017 [Member]    
Expiration date 6/22/2017  
Interest rate 0.64%  
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.20%, 4/28/2016 [Member]    
Expiration date   4/28/2016
Interest rate   0.20%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.26%, 5/05/2016 [Member]    
Expiration date   5/05/2016
Interest rate   0.26%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.46%, 6/23/2016 [Member]    
Expiration date   6/23/2016
Interest rate   0.46%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | COMEX Copper Futures HG May 2017 contracts, expiring May 2017 [Member]    
Interest rate 0.55%  
United States Agriculture Index Fund [Member]    
Debt Instrument, Collateral Amount $ 208,306 $ 139,467
Interest rate 0.005%  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | Ice-Us Cotton 2 Futures Ct March 2016 Contracts, Expiring March 2016 [Member]    
Expiration date   March 2016
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | Ice-Us Sugar 11 Futures Sb May 2016 Contracts, Expiring April 2016 [Member]    
Expiration date   April 2016
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | Ice-Us Cocoa Futures Cc July 2016 Contracts, Expiring July 2016 [Member]    
Expiration date   July 2016
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | ICE-Canola Futures RS March 2016 contracts, expiring March 2016 [Member]    
Expiration date   March 2016
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | ICE-US Coffee-C Futures KC July 2016 contracts, expiring July 2016 [Member]    
Expiration date   July 2016
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | ICE-US Cocoa Futures CC March 2017 contracts, expiring March 2017 [Member]    
Expiration date March 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | ICE-US Coffee-C Futures KC July 2017 contracts, expiring July 2017 [Member]    
Expiration date July 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | ICE-US Sugar 11 Futures SB May 2017 contracts, expiring April 2017 [Member]    
Expiration date April 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | ICE-Canola Futures RS March 2017 contracts, expiring March 2017 [Member]    
Expiration date March 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | Foreign [Member] | ICE-US Cotton 2 Futures CT March 2017 contracts, expiring March 2017 [Member]    
Expiration date March 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CBOT Corn Futures C September 2016 contracts, expiring September 2016 [Member]    
Expiration date   September 2016
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | KCBT Hard Red Winter Wheat Futures KW May 2017 contracts, expiring May 2017 [Member]    
Expiration date May 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CME Feeder Cattle Futures FC March 2017 contracts, expiring March 2017 [Member]    
Expiration date March 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CBOT Soybean Oil Futures BO March 2017 contracts, expiring March 2017 [Member]    
Expiration date March 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CBOT Wheat Futures W March 2017 contracts, expiring March 2017 [Member]    
Expiration date March 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CBOT Soybean Futures S November 2017 contracts, expiring November 2017 [Member]    
Expiration date November 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Cbot Soybean Futures S March 2016 Contracts, Expiring March 2016 [Member]    
Expiration date   March 2016
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Cme Feeder Cattle Futures Lc March 2016 Contracts, Expiring March 2016 [Member]    
Expiration date   March 2016
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | Cbot Soybean Oil Futures Bo July 2016, Expiring July 2016 [Member]    
Expiration date   July 2016
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CME Lean Hogs Futures LH April 2017 contracts, expiring April 2017 [Member]    
Expiration date April 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CME Live Cattle Futures LC April 2017 contracts, expiring April 2017 [Member]    
Expiration date April 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CBOT Soybean Meal Futures SM July 2017 contracts, expiring July 2017 [Member]    
Expiration date July 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CBOT Corn Futures C December 2017 contracts, expiring December 2017 [Member]    
Expiration date December 2017  
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CME Lean Hogs Futures LH February 2016 contracts, expiring February 2016 [Member]    
Expiration date   February 2016
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CME Live Cattle Futures LC February 2016 contracts, expiring February 2016 [Member]    
Expiration date   February 2016
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CBOT Soybean Meal Futures SM March 2016 contracts, expiring March 2016 [Member]    
Expiration date   March 2016
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | CBOT Wheat Futures W March 2016 contracts, expiring March 2016 [Member]    
Expiration date   March 2016
United States Agriculture Index Fund [Member] | Open Futures Contracts Long [Member] | United States Contracts [Member] | KCBT Hard Red Winter Wheat Futures KW May 2016 contracts, expiring May 2016 [Member]    
Expiration date   May 2016
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.34%, 1/05/2017 [Member]    
Expiration date 1/05/2017  
Interest rate 0.34%  
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.45%, 2/16/2017 [Member]    
Expiration date 2/16/2017  
Interest rate 0.45%  
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.49%, 5/04/2017 [Member]    
Expiration date 5/04/2017  
Interest rate 0.49%  
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.60%, 5/18/2017 [Member]    
Expiration date 5/18/2017  
Interest rate 0.60%  
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.64%, 6/22/2017 [Member]    
Expiration date 6/22/2017  
Interest rate 0.64%  
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.20%, 4/28/2017 [Member]    
Expiration date   4/28/2016
Interest rate   0.20%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.26%, 5/05/2017 [Member]    
Expiration date   5/05/2016
Interest rate   0.26%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S .Treasury Bills 0.46%, 6/23/2017 [Member]    
Expiration date   6/23/2016
Interest rate   0.46%