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Significant Accounting Policies (Quantitative Effect Of Adoption Of Investment Company Accounting) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Jan. 01, 2014
Mar. 31, 2015
Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at January 1, 2014 $ 234,158us-gaap_InvestmentInPhysicalCommodities   $ 152,842us-gaap_InvestmentInPhysicalCommodities $ 260,476us-gaap_InvestmentInPhysicalCommodities
Gain / (loss) as a result of change in accounting treatment 554us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome [1]      
Gold [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value       139,729gltr_InvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAU
Value at January 1, 2014 133,356us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU
139,729us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU
86,723us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU
139,729us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU
Gain / (loss) as a result of change in accounting treatment   0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome
/ us-gaap_CurrencyAxis
= currency_XAU
   
Silver [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value       83,152gltr_InvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAG
Value at January 1, 2014 65,115us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG
83,152us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG
44,469us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG
83,152us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG
Gain / (loss) as a result of change in accounting treatment   0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome
/ us-gaap_CurrencyAxis
= currency_XAG
   
Platinum [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value       21,057gltr_InvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPT
Value at January 1, 2014 17,940us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT
21,057us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT
10,998us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT
21,057us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT
Gain / (loss) as a result of change in accounting treatment   0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome
/ us-gaap_CurrencyAxis
= currency_XPT
   
Palladium [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Value at December 31, 2013 at lower of cost or market value       15,984gltr_InvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPD
Value at January 1, 2014 17,747us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD
16,538us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD
10,652us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD
16,538us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD
Gain / (loss) as a result of change in accounting treatment   $ 554us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome
/ 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.