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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
Sep. 30, 2013
Dec. 31, 2012
Bullion [Line Items]    
Investment in Bullion - average cost $ 226,439 $ 185,427
Unrealized gain / (loss) on investment in Bullion (30,997) 16,919
Investment in Bullion - market value 195,442 202,346
Gold [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 118,214 96,337
Unrealized gain / (loss) on investment in Bullion (12,601) 12,101
Investment in Bullion - market value 105,613 108,438
Silver [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 82,536 68,563
Unrealized gain / (loss) on investment in Bullion (19,246) 3,002
Investment in Bullion - market value 63,290 71,565
Platinum [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 15,234 12,213
Unrealized gain / (loss) on investment in Bullion (255) 1,020
Investment in Bullion - market value 14,979 13,233
Palladium [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 10,455 8,314
Unrealized gain / (loss) on investment in Bullion 1,105 796
Investment in Bullion - market value $ 11,560 $ 9,110