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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, 2014
Jan. 01, 2014
Dec. 31, 2013
Bullion [Line Items]      
Investment in bullion at cost $ 171,863   $ 259,922
Unrealized gain on investment in Bullion 14,855   554
Investment in Bullion - fair value 186,718 [1],[2]   260,476
Gold [Member]
      
Bullion [Line Items]      
Investment in bullion at cost 92,461   139,729
Unrealized gain on investment in Bullion 7,906   0
Investment in Bullion - fair value 100,367 [1],[2] 139,729 139,729
Silver [Member]
      
Bullion [Line Items]      
Investment in bullion at cost 54,924   83,152
Unrealized gain on investment in Bullion 3,482   0
Investment in Bullion - fair value 58,406 [1],[2] 83,152 83,152
Platinum [Member]
      
Bullion [Line Items]      
Investment in bullion at cost 13,898   21,057
Unrealized gain on investment in Bullion 1,163   0
Investment in Bullion - fair value 15,061 [1],[2] 21,057 21,057
Palladium [Member]
      
Bullion [Line Items]      
Investment in bullion at cost 10,580   15,984
Unrealized gain on investment in Bullion 2,304   554
Investment in Bullion - fair value $ 12,884 [1],[2] $ 16,538 $ 16,538
[1] Effective January 1, 2014, the Trust has adopted the provisions of Topic 946, Investment Companies, and follows specialized accounting. Refer to Note 2.1 for additional information.
[2] At June 30, 2014, Bullion is recorded at fair value. At December 31, 2013, Bullion was recorded at the lower of cost or market value. Refer to Note 2.1 for a breakdown of average cost and fair value per metal.