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Condensed Schedule of Investments (Parenthetical) (USD $)
6 Months Ended
Jun. 30, 2013
Collateral Amount On Open Futures Contracts $ 6,076,684
U.S. Treasury Bill [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
 
Interest rate 0.06%
Expiration date 11/21/2013
United States [Member] | NYMEX WTI Crude Oil Futures CL August 2013 contracts, expiring July 2013 [Member] | Open Cleared Swap and Futures Contracts [Member] | Open Futures Contracts, Long [Member]
 
Expiration date July 2013
United States [Member] | NYMEX WTI Crude Oil Futures CL September 2013 contracts, expiring August 2013 [Member] | Open Cleared Swap and Futures Contracts [Member] | Open Futures Contracts, Long [Member]
 
Expiration date August 2013
United States [Member] | NYMEX WTI Crude Oil Futures CL October 2013 contracts, expiring September 2013 [Member] | Open Cleared Swap and Futures Contracts [Member] | Open Futures Contracts, Long [Member]
 
Expiration date September 2013
United States [Member] | NYMEX WTI Crude Oil Futures CL November 2013 contracts, expiring October 2013 [Member] | Open Cleared Swap and Futures Contracts [Member] | Open Futures Contracts, Long [Member]
 
Expiration date October 2013
United States [Member] | NYMEX WTI Crude Oil Futures CL December 2013 contracts, expiring November 2013 [Member] | Open Cleared Swap and Futures Contracts [Member] | Open Futures Contracts, Long [Member]
 
Expiration date November 2013
United States [Member] | NYMEX WTI Crude Oil Futures CL January 2014 contracts, expiring December 2013 [Member] | Open Cleared Swap and Futures Contracts [Member] | Open Futures Contracts, Long [Member]
 
Expiration date December 2013
United States [Member] | NYMEX WTI Crude Oil Futures CL February 2014 contracts, expiring January 2014 [Member] | Open Cleared Swap and Futures Contracts [Member] | Open Futures Contracts, Long [Member]
 
Expiration date January 2014
United States [Member] | NYMEX WTI Crude Oil Futures CL March 2014 contracts, expiring February 2014 [Member] | Open Cleared Swap and Futures Contracts [Member] | Open Futures Contracts, Long [Member]
 
Expiration date February 2014
United States [Member] | NYMEX WTI Crude Oil Futures CL April 2014 contracts, expiring March 2014 [Member] | Open Cleared Swap and Futures Contracts [Member] | Open Futures Contracts, Long [Member]
 
Expiration date March 2014
United States [Member] | NYMEX WTI Crude Oil Futures CL May 2014 Contracts, Expiring April 2014 [Member] | Open Cleared Swap and Futures Contracts [Member] | Open Futures Contracts, Long [Member]
 
Expiration date April 2014
United States [Member] | NYMEX WTI Crude Oil Futures CL June 2014 Contracts, Expiring May 2014 [Member] | Open Cleared Swap and Futures Contracts [Member] | Open Futures Contracts, Long [Member]
 
Expiration date May 2014
United States [Member] | NYMEX WTI Crude Oil Futures CL July 2014 Contracts, Expiring June 2014 [Member] | Open Cleared Swap and Futures Contracts [Member] | Open Futures Contracts, Long [Member]
 
Expiration date June 2014
United States [Member] | U.S. Treasury Bill [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
 
Interest rate 0.06%
Expiration date 11/21/2013