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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
Dec. 31, 2013
Dec. 31, 2012
Bullion [Line Items]    
Investment in Bullion - average cost $ 308,780 $ 185,427
Realized loss on investment in Bullion (48,858)  
Investment in Bullion - lower of cost or market value 259,922  
Unrealized gain on investment in Bullion 554 16,919
Investment in Bullion - market value 260,476 202,346
Gold [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 162,839 96,337
Realized loss on investment in Bullion (23,109)  
Investment in Bullion - lower of cost or market value 139,730  
Unrealized gain on investment in Bullion 0 12,101
Investment in Bullion - market value 139,730 108,438
Silver [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 108,001 68,563
Realized loss on investment in Bullion (24,850)  
Investment in Bullion - lower of cost or market value 83,151  
Unrealized gain on investment in Bullion 0 3,002
Investment in Bullion - market value 83,151 71,565
Platinum [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 21,956 12,213
Realized loss on investment in Bullion (899)  
Investment in Bullion - lower of cost or market value 21,057  
Unrealized gain on investment in Bullion 0 1,020
Investment in Bullion - market value 21,057 13,233
Palladium [Member]
    
Bullion [Line Items]    
Investment in Bullion - average cost 15,984 8,314
Realized loss on investment in Bullion 0  
Investment in Bullion - lower of cost or market value 15,984  
Unrealized gain on investment in Bullion 554 796
Investment in Bullion - market value $ 16,538 $ 9,110