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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
Dec. 31, 2014
Jan. 01, 2014
Dec. 31, 2013
Dec. 31, 2012
Bullion [Line Items]        
Investment in bullion at cost $ 242,403us-gaap_InvestmentOwnedAtCost   $ 259,922us-gaap_InvestmentOwnedAtCost  
Unrealized gain / (loss) on investment in Bullion (8,245)gltr_UnrealizedGainLossOnInvestmentInBullion   554gltr_UnrealizedGainLossOnInvestmentInBullion  
Investment in Bullion - fair value 234,158us-gaap_InvestmentInPhysicalCommodities [1],[2]   260,476us-gaap_InvestmentInPhysicalCommodities 185,427us-gaap_InvestmentInPhysicalCommodities
Gold [Member]        
Bullion [Line Items]        
Investment in bullion at cost 133,156us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XAU		   139,729us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XAU		  
Unrealized gain / (loss) on investment in Bullion 200gltr_UnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAU		   0gltr_UnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAU		  
Investment in Bullion - fair value 133,356us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU		 [1],[2] 139,729us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU		 139,729us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU		 96,337us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU
Silver [Member]        
Bullion [Line Items]        
Investment in bullion at cost 73,612us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XAG		   83,152us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XAG		  
Unrealized gain / (loss) on investment in Bullion (8,497)gltr_UnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAG		   0gltr_UnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAG		  
Investment in Bullion - fair value 65,115us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG		 [1],[2] 83,152us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG		 83,152us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG		 68,562us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG
Platinum [Member]        
Bullion [Line Items]        
Investment in bullion at cost 19,160us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPT		   21,057us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPT		  
Unrealized gain / (loss) on investment in Bullion (1,220)gltr_UnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPT		   0gltr_UnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPT		  
Investment in Bullion - fair value 17,940us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT		 [1],[2] 21,057us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT		 21,057us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT		 12,213us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT
Palladium [Member]        
Bullion [Line Items]        
Investment in bullion at cost 16,475us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPD		   15,984us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPD		  
Unrealized gain / (loss) on investment in Bullion 1,272gltr_UnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPD		   554gltr_UnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPD		  
Investment in Bullion - fair value $ 17,747us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD		 [1],[2] $ 16,538us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD		 $ 16,538us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD		 $ 8,315us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD
[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] At December 31, 2014, the investment in Bullion is valued at fair value. At December 31, 2013 the investment in Bullion was valued at the lower of cost or market value. Refer to note 2.1 for a breakdown of cost and fair value of the investment in Bullion.