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Significant Accounting Policies (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Cost Of Palladium Payable (in Dollars) $ 12,289,756   $ 12,289,756    
Annualized Rate Of Sponsors Fee     0.60%    
Sponsor Fees (in Dollars) 766,109 1,164,494 1,455,311 2,494,695  
Accounts Payable, Related Parties, Current (in Dollars) $ 235,824   $ 235,824   $ 194,805 [1]
[1] Derived from audited Statement of Financial Condition as of December 31, 2011.