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Significant Accounting Policies (Quantitative Effect Of Adoption Of Investment Company Accounting) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Jan. 02, 2014
Dec. 31, 2013
Dec. 31, 2012
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value     $ 259,922 $ 185,427
Value at January 1, 2014 188,022   260,476  
Gold [Member]
        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value     139,729 [1],[2] 96,337
Value at January 1, 2014 102,539 [1],[3] 139,729 139,729  
Gain / (loss) as a result of change in accounting treatment 0      
Silver [Member]
        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value     83,152 [1],[2] 68,562
Value at January 1, 2014 58,124 [1],[3] 83,152 83,152  
Gain / (loss) as a result of change in accounting treatment 0      
Platinum [Member]
        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value     21,057 [1],[2] 12,213
Value at January 1, 2014 15,008 [1],[3] 21,057 21,057  
Gain / (loss) as a result of change in accounting treatment 0      
Palladium [Member]
        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value     15,984 [1],[2] 8,315
Value at January 1, 2014 12,351 [1],[3] 16,538 16,538  
Gain / (loss) as a result of change in accounting treatment $ 554      
[1] 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.
[2] Derived from audited Statement of Financial Condition as of December 31, 2013.
[3] 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.