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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
Jun. 30, 2013
Dec. 31, 2012
Bullion [Line Items]    
Investment in Bullion - average cost $ 215,664 $ 185,427
Unrealized gain / (loss) on investment in Bullion (50,909) 16,919
Investment in Bullion - market value 164,755 202,346
Gold [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 112,436 96,337
Unrealized gain / (loss) on investment in Bullion (22,668) 12,101
Investment in Bullion - market value 89,768 108,438
Silver [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 79,002 68,563
Unrealized gain / (loss) on investment in Bullion (26,924) 3,002
Investment in Bullion - market value 52,078 71,565
Platinum [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 14,388 12,213
Unrealized gain / (loss) on investment in Bullion (1,164) 1,020
Investment in Bullion - market value 13,224 13,233
Palladium [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 9,838 8,314
Unrealized gain / (loss) on investment in Bullion (153) 796
Investment in Bullion - market value $ 9,685 $ 9,110