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OFFSETTING ASSETS AND LIABILITIES (Tables)
 3 Months Ended
Mar. 31, 2013
Offsetting Assets and Liabilities [Line Items]  
Offsetting Assets

Offsetting of Financial Assets and Derivative Assets as of March 31, 2013 and December 31, 2012

 

Assets   Gross
Amounts of
Recognized
Assets		     Gross
Amounts
Offset in the
Statements of
Financial
Condition		     Net Amounts
of Assets
Presented in
the
Statements of
Financial
Condition		  
                   
At March 31, 2013:                        
Futures contracts   $ 77,060     $ —     $ 77,060  
                         
At December 31, 2012:                        
Futures contracts   $ 739,330     $ —     $ 739,330
Collateral Held By Counterparty [Member]
  
Offsetting Assets and Liabilities [Line Items]  
Offsetting Assets

Financial Assets, Derivative Assets, and Collateral Held by Counterparty as of March 31, 2013 and December 31, 2012

 

     Gross Amounts Not Offset in the
Statements of Financial Condition		    
  Net Amounts
of Assets
Presented in
the
Statements of
Financial
Condition (A)		  Financial
Instruments
Collateral
Received (B)		  Cash
Collateral
Received (C)		  Net Amount
(D)=(A)-(B)-(C)		 
             
At March 31, 2013:                
UBS Securities $77,060  $—  $—  $77,060 
                 
At December 31, 2012:                
UBS Securities $739,330  $—  $—  $739,330