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Significant Accounting Policies (Schedule Of Unrealized Gains Or Losses On The Trust's Bullion Holdings) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Bullion [Line Items]    
Investment in Bullion - average cost $ 208,270 $ 185,427
Unrealized gain / (loss) on investment in Bullion 10,029 16,919
Investment in Bullion - market value 218,299 202,346
Gold [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 108,358 96,337
Unrealized gain / (loss) on investment in Bullion 7,458 12,101
Investment in Bullion - market value 115,816 108,438
Silver [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 76,713 68,563
Unrealized gain / (loss) on investment in Bullion (617) 3,002
Investment in Bullion - market value 76,096 71,565
Platinum [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 13,801 12,213
Unrealized gain / (loss) on investment in Bullion 1,426 1,020
Investment in Bullion - market value 15,227 13,233
Palladium [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 9,398 8,314
Unrealized gain / (loss) on investment in Bullion 1,762 796
Investment in Bullion - market value $ 11,160 $ 9,110