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Significant Accounting Policies (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2011
Silver [Member]
Jun. 30, 2012
Silver [Member]
Dec. 31, 2011
Platinum [Member]
Jun. 30, 2012
Platinum [Member]
Dec. 31, 2011
Palladium [Member]
Jun. 30, 2012
Palladium [Member]
Jun. 30, 2012
Gold [Member]
Dec. 31, 2011
Gold [Member]
Bullion Cost Reduced (in Dollars per Item)           28.18   1,381.00   636.00      
$ 4,302,195   $ 4,302,195   $ 8,694,716 [1] $ 3,077,647 $ 1,474,337 $ 548,453 $ 282,711 $ 378,873 $ 171,646 $ 2,373,501 $ 4,689,743
Annualized Rate Of Sponsors Fee     0.60%                    
Sponsor Fees 278,873 359,137 575,661 639,485                  
Accounts Payable, Related Parties, Current $ 86,960   $ 86,960   $ 107,543 [1]                
[1] Derived from audited Statement of Financial Condition as of December 31, 2011.