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Significant Accounting Policies (Detail) - Schedule of Investment in Bullion (Parentheticals) (USD $)
Jun. 30, 2012
oz
Dec. 31, 2011
oz
Gold [Member]
    
Bullion Payable Ounces Of Bullion 1,484.8 [1] 2,978.6
Bullion Payable (in Dollars) $ 2,159,242 $ 4,317,263 [2]
Silver [Member]
    
Bullion Payable Ounces Of Bullion 54,443.8 [1] 109,213.9
Bullion Payable (in Dollars) 1,539,137 3,077,647 [2]
Platinum [Member]
    
Bullion Payable Ounces Of Bullion 197.9 [1] 397.1
Bullion Payable (in Dollars) 274,627 548,453 [2]
Palladium [Member]
    
Bullion Payable Ounces Of Bullion 297.0 [1] 595.7
Bullion Payable (in Dollars) $ 189,252 $ 378,873 [2]
[1] Market value of Bullion payable at December 31, 2011 - $4,689,743, $3,077,647, $548,453 and $378,873, respectively.
[2] Market value of Bullion payable at June 30, 2012 - $2,373,501, $1,474,337, $282,711 and $171,646, respectively.