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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
Jun. 30, 2015
Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at January 1, 2014   $ 234,158 $ 144,823 $ 260,476
Gain / (loss) as a result of change in accounting treatment [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       139,729
Value at January 1, 2014 $ 139,729 133,356 83,714 139,729
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
Value at January 1, 2014 83,152 65,115 41,154 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
Value at January 1, 2014 21,057 17,940 10,275 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
Value at January 1, 2014 16,538 $ 17,747 $ 9,680 $ 16,538
Gain / (loss) as a result of change in accounting treatment $ 554      
[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.