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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
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Bullion [Line Items] |  |  |  |  |
Investment in bullion at cost | $ 242,403 us-gaap_InvestmentOwnedAtCost |  |  | $ 259,922 us-gaap_InvestmentOwnedAtCost |
Unrealized gain / (loss) on investment in Bullion | (8,245)gltr_UnrealizedGainLossOnInvestmentInBullion |  |  | 554 gltr_UnrealizedGainLossOnInvestmentInBullion |
Investment in Bullion - fair value | 234,158 us-gaap_InvestmentInPhysicalCommodities | [1],[2] |  | 260,476 us-gaap_InvestmentInPhysicalCommodities | 185,427 us-gaap_InvestmentInPhysicalCommodities
Gold [Member] |  |  |  |  |
Bullion [Line Items] |  |  |  |  |
Investment in bullion at cost | 133,156 us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XAU |  |  | 139,729 us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XAU |
Unrealized gain / (loss) on investment in Bullion | 200 gltr_UnrealizedGainLossOnInvestmentInBullion / us-gaap_CurrencyAxis = currency_XAU |  |  | 0 gltr_UnrealizedGainLossOnInvestmentInBullion / us-gaap_CurrencyAxis = currency_XAU |
Investment in Bullion - fair value | 133,356 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XAU | [1],[2] | 139,729 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XAU | 139,729 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XAU | 96,337 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XAU
Silver [Member] |  |  |  |  |
Bullion [Line Items] |  |  |  |  |
Investment in bullion at cost | 73,612 us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XAG |  |  | 83,152 us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XAG |
Unrealized gain / (loss) on investment in Bullion | (8,497)gltr_UnrealizedGainLossOnInvestmentInBullion / us-gaap_CurrencyAxis = currency_XAG |  |  | 0 gltr_UnrealizedGainLossOnInvestmentInBullion / us-gaap_CurrencyAxis = currency_XAG |
Investment in Bullion - fair value | 65,115 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XAG | [1],[2] | 83,152 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XAG | 83,152 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XAG | 68,562 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XAG
Platinum [Member] |  |  |  |  |
Bullion [Line Items] |  |  |  |  |
Investment in bullion at cost | 19,160 us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XPT |  |  | 21,057 us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XPT |
Unrealized gain / (loss) on investment in Bullion | (1,220)gltr_UnrealizedGainLossOnInvestmentInBullion / us-gaap_CurrencyAxis = currency_XPT |  |  | 0 gltr_UnrealizedGainLossOnInvestmentInBullion / us-gaap_CurrencyAxis = currency_XPT |
Investment in Bullion - fair value | 17,940 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XPT | [1],[2] | 21,057 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XPT | 21,057 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XPT | 12,213 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XPT
Palladium [Member] |  |  |  |  |
Bullion [Line Items] |  |  |  |  |
Investment in bullion at cost | 16,475 us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XPD |  |  | 15,984 us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XPD |
Unrealized gain / (loss) on investment in Bullion | 1,272 gltr_UnrealizedGainLossOnInvestmentInBullion / us-gaap_CurrencyAxis = currency_XPD |  |  | 554 gltr_UnrealizedGainLossOnInvestmentInBullion / us-gaap_CurrencyAxis = currency_XPD |
Investment in Bullion - fair value | $ 17,747 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XPD | [1],[2] | $ 16,538 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XPD | $ 16,538 us-gaap_InvestmentInPhysicalCommodities / us-gaap_CurrencyAxis = currency_XPD | $ 8,315 us-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.

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