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Condensed Statement of Changes in Net Assets (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Condensed Statement of Changes in Net Assets [Abstract]      
Opening balance (in Shares) 3,850,000us-gaap_SharesOutstanding 3,950,000us-gaap_SharesOutstanding [1] 3,950,000us-gaap_SharesOutstanding [1]
Creations (in Shares) 100,000us-gaap_StockIssuedDuringPeriodSharesNewIssues   1,850,000us-gaap_StockIssuedDuringPeriodSharesNewIssues [1]
Redemptions (in Shares) (1,500,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares   (1,950,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares [1]
Closing balance (in Shares) 2,450,000us-gaap_SharesOutstanding   3,850,000us-gaap_SharesOutstanding
Opening balance $ 237,152us-gaap_StockholdersEquity [2] $ 259,804us-gaap_StockholdersEquity [1] $ 259,804us-gaap_StockholdersEquity [1]
Effect of adoption of new accounting principle (see Note 2.1)     554us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome [1]
Net investment loss (282)gltr_NetInvestmentGainLoss (311)gltr_NetInvestmentGainLoss (1,089)gltr_NetInvestmentGainLoss [1]
Realized gain on investment in Bullion 1,592us-gaap_RealizedInvestmentGainsLosses   2,832us-gaap_RealizedInvestmentGainsLosses [1]
Change in unrealized gain on investment Bullion 1,933gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion 8,727gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion (8,799)gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion [1]
Creations 6,311us-gaap_StockIssuedDuringPeriodValueNewIssues   114,973us-gaap_StockIssuedDuringPeriodValueNewIssues [1]
Redemptions (96,999)us-gaap_StockRedeemedOrCalledDuringPeriodValue   (131,123)us-gaap_StockRedeemedOrCalledDuringPeriodValue [1]
Closing balance $ 149,707us-gaap_StockholdersEquity   $ 237,152us-gaap_StockholdersEquity [2]
[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] Authorized share capital is unlimited with no par value per Share. Shares issued and outstanding at March 31, 2015 were 2,450,000 and at December 31, 2014 were 3,850,000. Net asset value per Share at March 31, 2015 and December 31, 2014 was $61.10 and $61.60, respectively.