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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, 2014
Jan. 02, 2014
Dec. 31, 2013
Bullion [Line Items]      
Investment in bullion - average cost $ 178,741   $ 259,922
Unrealized gain on investment in Bullion 9,281   554
Investment in Bullion - fair value 188,022   260,476
Gold [Member]
      
Bullion [Line Items]      
Investment in bullion - average cost 96,162 [1]   139,729 [2]
Unrealized gain on investment in Bullion 6,377   0
Investment in Bullion - fair value 102,539 [1],[3] 139,729 139,729
Silver [Member]
      
Bullion [Line Items]      
Investment in bullion - average cost 57,122 [1]   83,152 [2]
Unrealized gain on investment in Bullion 1,002   0
Investment in Bullion - fair value 58,124 [1],[3] 83,152 83,152
Platinum [Member]
      
Bullion [Line Items]      
Investment in bullion - average cost 14,454 [1]   21,057 [2]
Unrealized gain on investment in Bullion 554   0
Investment in Bullion - fair value 15,008 [1],[3] 21,057 21,057
Palladium [Member]
      
Bullion [Line Items]      
Investment in bullion - average cost 11,003 [1]   15,984 [2]
Unrealized gain on investment in Bullion 1,348   554
Investment in Bullion - fair value $ 12,351 [1],[3] $ 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] Derived from audited Statement of Financial Condition as of December 31, 2013.
[3] At March 31, 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.