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Significant Accounting Policies (Quantitative Effect Of Adoption Of Investment Company Accounting) (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended
Jan. 01, 2014
Sep. 30, 2014
Jan. 01, 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 [1],[2] $ 185,427
Value at January 1, 2014   159,175 [1],[3]   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   89,143 [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   45,972 [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   12,702 [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   11,358 [1],[3] 16,538 16,538  
Gain / (loss) as a result of change in accounting treatment $ 554        
[1] At September 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.
[2] Derived from audited Statement of Financial Condition as of December 31, 2013. The amounts are those previously reported under non investment company accounting. Refer to Note 2.1 for additional information.
[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.