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Significant Accounting Policies (Quantitative Effect Of Adoption Of Investment Company Accounting) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2014
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value   $ 234,158    
Value at January 1, 2014 at fair value   234,158 $ 161,846 $ 260,476
Gain / (loss) as a result of change in accounting principle [1]   554    
Gold [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value   133,356   139,729
Value at January 1, 2014 at fair value $ 139,729 133,356 95,796 139,729
Silver [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value   65,115   83,152
Value at January 1, 2014 at fair value 83,152 65,115 45,699 83,152
Platinum [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value   17,940   21,057
Value at January 1, 2014 at fair value 21,057 17,940 10,485 21,057
Palladium [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value   17,747   15,984
Value at January 1, 2014 at fair value 16,538 $ 17,747 $ 9,866 $ 16,538
Gain / (loss) as a result of change in accounting principle $ 554      
[1] Effective January 1, 2014, the Trust has adopted the provisions of Topic 946. Refer to Note 2.1 for additional information.