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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) 7,800,000us-gaap_SharesOutstanding [1] 8,750,000us-gaap_SharesOutstanding [1] 8,750,000us-gaap_SharesOutstanding [1]
Creations (in Shares) 200,000us-gaap_StockIssuedDuringPeriodSharesNewIssues   50,000us-gaap_StockIssuedDuringPeriodSharesNewIssues [1]
Redemptions (in Shares) (100,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares   (1,000,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares [1]
Closing balance (in Shares) 7,900,000us-gaap_SharesOutstanding   7,800,000us-gaap_SharesOutstanding [1]
Opening balance $ 916,197us-gaap_StockholdersEquity [1] $ 1,033,745us-gaap_StockholdersEquity [1] $ 1,033,745us-gaap_StockholdersEquity [1]
Effect of adoption of new accounting principle (see Note 2.1)     0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification [1]
Net investment loss (907)sgol_NetInvestmentGainLoss (1,053)sgol_NetInvestmentGainLoss (4,166)sgol_NetInvestmentGainLoss [1]
Realized loss on investment in gold (314)us-gaap_RealizedInvestmentGainsLosses   721us-gaap_RealizedInvestmentGainsLosses [1]
Change in unrealized loss on investment in gold (10,394)sgol_ChangeInUnrealizedGainLossOnInvestmentInBullion 77,157sgol_ChangeInUnrealizedGainLossOnInvestmentInBullion (2,266)sgol_ChangeInUnrealizedGainLossOnInvestmentInBullion [1]
Change in unrealized loss on unsettled creations or redemptions (125)sgol_ChangeInUnrealizedGainLossOnUnsettledCreationsOrRedemptions   133sgol_ChangeInUnrealizedGainLossOnUnsettledCreationsOrRedemptions [1]
Creations 24,496us-gaap_StockIssuedDuringPeriodValueNewIssues   6,437us-gaap_StockIssuedDuringPeriodValueNewIssues [1]
Redemptions (11,373)us-gaap_StockRedeemedOrCalledDuringPeriodValue   (118,407)us-gaap_StockRedeemedOrCalledDuringPeriodValue [1]
Closing balance $ 917,580us-gaap_StockholdersEquity   $ 916,197us-gaap_StockholdersEquity [1]
[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.