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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
oz
Mar. 31, 2014
oz
Dec. 31, 2014
oz
Bullion [Line Items]      
Opening balance (in Ounces) 4,225,571.5us-gaap_InvestmentOwnedBalanceOtherMeasure 4,419,242.6us-gaap_InvestmentOwnedBalanceOtherMeasure 4,419,242.6us-gaap_InvestmentOwnedBalanceOtherMeasure
Creations (in Ounces) 166,715.6gltr_CreationsOuncesOfBullion   2,002,549.7gltr_CreationsOuncesOfBullion
Redemptions (in Ounces) (1,610,911.6)gltr_RedemptionsOuncesOfBullion   (2,177,873.5)gltr_RedemptionsOuncesOfBullion
Transfers of Bullion to pay expenses (in Ounces) (5,085.6)gltr_TransfersOfBullionOunces   (18,347.3)gltr_TransfersOfBullionOunces
Closing balance (in Ounces) 2,776,289.9us-gaap_InvestmentOwnedBalanceOtherMeasure   4,225,571.5us-gaap_InvestmentOwnedBalanceOtherMeasure
Investment in Bullion, fair value, opening balance $ 234,158us-gaap_InvestmentInPhysicalCommodities $ 260,476us-gaap_InvestmentInPhysicalCommodities $ 260,476us-gaap_InvestmentInPhysicalCommodities
Creations 9,390gltr_CreationsValueOfBullion   111,893gltr_CreationsValueOfBullion
Redemptions (93,942)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable   (131,123)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
Realized (loss) / gain on Bullion transferred for redemptions 1,595gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares 3,446gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares 2,796gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
Transfers of Bullion to pay expenses (289)gltr_CostOfBullionTransferredToPayExpenses   (1,121)gltr_CostOfBullionTransferredToPayExpenses
Realized (loss) / gain on Bullion transferred to pay expenses (3)us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses 10us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses 36us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
Unrealized gain / (loss) on investment in Bullion 1,933gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion 8,727gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion (8,799)gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion [1]
Investment in Bullion, fair value, closing balance 152,842us-gaap_InvestmentInPhysicalCommodities   234,158us-gaap_InvestmentInPhysicalCommodities
Gold [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) 111,199.3us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAU		 116,295.9us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAU		 116,295.9us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAU
Creations (in Ounces) 4,387.3gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAU		   52,698.7gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAU
Redemptions (in Ounces) (42,392.4)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAU		   (57,312.5)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAU
Transfers of Bullion to pay expenses (in Ounces) (133.8)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XAU		   (482.8)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XAU
Closing balance (in Ounces) 73,060.4us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAU		   111,199.3us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAU
Investment in Bullion, fair value, opening balance 133,356us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU		 139,729us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU		 139,729us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU
Creations 5,341gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XAU		   63,012gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XAU
Redemptions (53,422)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XAU		   (71,795)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XAU
Realized (loss) / gain on Bullion transferred for redemptions 2,627gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XAU		   2,793gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XAU
Transfers of Bullion to pay expenses (164)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAU		   (610)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAU
Realized (loss) / gain on Bullion transferred to pay expenses 3us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAU		   27us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAU
Unrealized gain / (loss) on investment in Bullion (1,018)gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAU		   200gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAU
Investment in Bullion, fair value, closing balance 86,723us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU		   133,356us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU
Silver [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) 4,077,306.0us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAG		 4,264,181.5us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAG		 4,264,181.5us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAG
Creations (in Ounces) 160,865.8gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAG		   1,932,284.8gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAG
Redemptions (in Ounces) (1,554,388.4)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAG		   (2,101,456.8)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAG
Transfers of Bullion to pay expenses (in Ounces) (4,907.2)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XAG		   (17,703.5)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XAG
Closing balance (in Ounces) 2,678,876.2us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAG		   4,077,306.0us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAG
Investment in Bullion, fair value, opening balance 65,115us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG		 83,152us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG		 83,152us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG
Creations 2,628gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XAG		   31,840gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XAG
Redemptions (26,932)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XAG		   (40,304)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XAG
Realized (loss) / gain on Bullion transferred for redemptions (1,030)gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XAG		   (729)gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XAG
Transfers of Bullion to pay expenses (81)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAG		   (344)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAG
Realized (loss) / gain on Bullion transferred to pay expenses (7)us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAG		   (3)us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAG
Unrealized gain / (loss) on investment in Bullion 4,776gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAG		   (8,497)gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAG
Investment in Bullion, fair value, closing balance 44,469us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG		   65,115us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG
Platinum [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) 14,826.5us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPT		 15,506.1us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPT		 15,506.1us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPT
Creations (in Ounces) 585.0gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPT		   7,026.5gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPT
Redemptions (in Ounces) (5,652.3)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPT		   (7,641.7)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPT
Transfers of Bullion to pay expenses (in Ounces) (17.8)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XPT		   (64.4)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XPT
Closing balance (in Ounces) 9,741.4us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPT		   14,826.5us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPT
Investment in Bullion, fair value, opening balance 17,940us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT		 21,057us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT		 21,057us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT
Creations 716gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XPT		   8,584gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XPT
Redemptions (6,919)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XPT		   (10,609)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XPT
Realized (loss) / gain on Bullion transferred for redemptions (370)gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XPT		   216gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XPT
Transfers of Bullion to pay expenses (22)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPT		   (90)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPT
Realized (loss) / gain on Bullion transferred to pay expenses (1)us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPT		   2us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPT
Unrealized gain / (loss) on investment in Bullion (346)gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPT		   (1,220)gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPT
Investment in Bullion, fair value, closing balance 10,998us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT		   17,940us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT
Palladium [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) 22,239.7us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPD		 23,259.1us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPD		 23,259.1us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPD
Creations (in Ounces) 877.5gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPD		   10,539.7gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPD
Redemptions (in Ounces) (8,478.5)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPD		   (11,462.5)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPD
Transfers of Bullion to pay expenses (in Ounces) (26.8)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XPD		   (96.6)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XPD
Closing balance (in Ounces) 14,611.9us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPD		   22,239.7us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPD
Investment in Bullion, fair value, opening balance 17,747us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD		 16,538us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD		 16,538us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD
Creations 705gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XPD		   8,457gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XPD
Redemptions (6,669)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XPD		   (8,415)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XPD
Realized (loss) / gain on Bullion transferred for redemptions 368gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XPD		   516gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XPD
Transfers of Bullion to pay expenses (22)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPD		   (77)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPD
Realized (loss) / gain on Bullion transferred to pay expenses 2us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPD		   10us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPD
Unrealized gain / (loss) on investment in Bullion (1,479)gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPD		   718gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPD
Investment in Bullion, fair value, closing balance $ 10,652us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD		   $ 17,747us-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.