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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
oz
Dec. 31, 2013
oz
Dec. 31, 2012
oz
Bullion [Line Items]      
Opening balance (in Ounces) 4,419,242.6us-gaap_InvestmentOwnedBalanceOtherMeasure 2,476,357.1us-gaap_InvestmentOwnedBalanceOtherMeasure  
Creations (in Ounces) 2,002,549.7gltr_CreationsOuncesOfBullion 2,295,568.0gltr_CreationsOuncesOfBullion  
Redemptions (in Ounces) (2,177,873.5)gltr_RedemptionsOuncesOfBullion (335,841.4)gltr_RedemptionsOuncesOfBullion  
Transfers of Bullion to pay expenses (in Ounces) (18,347.3)gltr_TransfersOfBullionOunces (16,841.1)gltr_TransfersOfBullionOunces  
Closing balance (in Ounces) 4,225,571.5us-gaap_InvestmentOwnedBalanceOtherMeasure 4,419,242.6us-gaap_InvestmentOwnedBalanceOtherMeasure 2,476,357.1us-gaap_InvestmentOwnedBalanceOtherMeasure
Investment in Bullion, fair value, opening balance $ 260,476us-gaap_InvestmentInPhysicalCommodities $ 185,427us-gaap_InvestmentInPhysicalCommodities  
Investment in Bullion, lower of cost or market value, pening balance 259,922gltr_InvestmentInBullion [1],[2]    
Creations 111,893gltr_CreationsValueOfBullion 149,236gltr_CreationsValueOfBullion [3] 24,100gltr_CreationsValueOfBullion [3]
Redemptions (131,123)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable (20,607)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable  
Realized (loss) / gain on Bullion transferred for redemptions 2,796gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares [4] (4,010)gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares [5] 1,530gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares [5]
Transfers of Bullion to pay expenses (1,121)gltr_CostOfBullionTransferredToPayExpenses (1,187)gltr_CostOfBullionTransferredToPayExpenses  
Realized gain / (loss) on Bullion transferred to pay expenses 36us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses [4] (79)us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses [5] 119us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses [5]
Unrealized gain / (loss) on investment in Bullion (8,799)gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion [4] 0gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion [5] 0gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion [5]
Realized loss on investment in Bullion 0gltr_RealizedGainLossOnBullion [4] (48,858)gltr_RealizedGainLossOnBullion [5] 0gltr_RealizedGainLossOnBullion [5]
Investment in Bullion, fair value, closing balance 234,158us-gaap_InvestmentInPhysicalCommodities [1],[4] 260,476us-gaap_InvestmentInPhysicalCommodities 185,427us-gaap_InvestmentInPhysicalCommodities
Investment in Bullion, lower of cost or market value, closing balance   259,922gltr_InvestmentInBullion [1],[2]  
Gold [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) 116,295.9us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAU		 65,167.3us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAU		  
Creations (in Ounces) 52,698.7gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAU		 60,409.7gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAU		  
Redemptions (in Ounces) (57,312.5)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAU		 (8,837.9)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAU		  
Transfers of Bullion to pay expenses (in Ounces) (482.8)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XAU		 (443.2)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XAU		  
Closing balance (in Ounces) 111,199.3us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAU		 116,295.9us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAU		  
Investment in Bullion, fair value, opening balance 139,729us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU		 96,337us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU		  
Investment in Bullion, lower of cost or market value, pening balance 139,729gltr_InvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAU		 [1],[2]    
Creations 63,012gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XAU		 80,050gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XAU		  
Redemptions (71,795)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XAU		 (11,140)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XAU		  
Realized (loss) / gain on Bullion transferred for redemptions 2,793gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XAU		 (1,748)gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XAU		  
Transfers of Bullion to pay expenses (610)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAU		 (638)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAU		  
Realized gain / (loss) on Bullion transferred to pay expenses 27us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAU		 (22)us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAU		  
Unrealized gain / (loss) on investment in Bullion 200gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAU		    
Realized loss on investment in Bullion   (23,110)gltr_RealizedGainLossOnBullion
/ us-gaap_CurrencyAxis
= currency_XAU		  
Investment in Bullion, fair value, closing balance 133,356us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU		 [1],[4] 139,729us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAU		  
Investment in Bullion, lower of cost or market value, closing balance   139,729gltr_InvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAU		 [1],[2]  
Silver [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) 4,264,181.5us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAG		 2,389,467.4us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAG		  
Creations (in Ounces) 1,932,284.8gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAG		 2,215,021.8gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAG		  
Redemptions (in Ounces) (2,101,456.8)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAG		 (324,057.5)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XAG		  
Transfers of Bullion to pay expenses (in Ounces) (17,703.5)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XAG		 (16,250.2)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XAG		  
Closing 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		  
Investment in Bullion, fair value, opening balance 83,152us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG		 68,562us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG		  
Investment in Bullion, lower of cost or market value, pening balance 83,152gltr_InvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAG		 [1],[2]    
Creations 31,840gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XAG		 48,772gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XAG		  
Redemptions (40,304)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XAG		 (6,589)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XAG		  
Realized (loss) / gain on Bullion transferred for redemptions (729)gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XAG		 (2,280)gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XAG		  
Transfers of Bullion to pay expenses (344)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAG		 (397)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAG		  
Realized gain / (loss) on Bullion transferred to pay expenses (3)us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAG		 (67)us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XAG		  
Unrealized gain / (loss) on investment in Bullion (8,497)gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAG		    
Realized loss on investment in Bullion   (24,849)gltr_RealizedGainLossOnBullion
/ us-gaap_CurrencyAxis
= currency_XAG		  
Investment in Bullion, fair value, closing balance 65,115us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG		 [1],[4] 83,152us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XAG		  
Investment in Bullion, lower of cost or market value, closing balance   83,152gltr_InvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XAG		 [1],[2]  
Platinum [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) 15,506.1us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPT		 8,689.0us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPT		  
Creations (in Ounces) 7,026.5gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPT		 8,054.6gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPT		  
Redemptions (in Ounces) (7,641.7)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPT		 (1,178.4)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPT		  
Transfers of Bullion to pay expenses (in Ounces) (64.4)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XPT		 (59.1)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XPT		  
Closing balance (in Ounces) 14,826.5us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPT		 15,506.1us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPT		  
Investment in Bullion, fair value, opening balance 21,057us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT		 12,213us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT		  
Investment in Bullion, lower of cost or market value, pening balance 21,057gltr_InvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPT		 [1],[2]    
Creations 8,584gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XPT		 11,510gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XPT		  
Redemptions (10,609)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XPT		 (1,619)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XPT		  
Realized (loss) / gain on Bullion transferred for redemptions 216gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XPT		 (64)gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XPT		  
Transfers of Bullion to pay expenses (90)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPT		 (88)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPT		  
Realized gain / (loss) on Bullion transferred to pay expenses 2us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPT		 4us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPT		  
Unrealized gain / (loss) on investment in Bullion (1,220)gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPT		    
Realized loss on investment in Bullion   (899)gltr_RealizedGainLossOnBullion
/ us-gaap_CurrencyAxis
= currency_XPT		  
Investment in Bullion, fair value, closing balance 17,940us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT		 [1],[4] 21,057us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPT		  
Investment in Bullion, lower of cost or market value, closing balance   21,057gltr_InvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPT		 [1],[2]  
Palladium [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) 23,259.1us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPD		 13,033.4us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPD		  
Creations (in Ounces) 10,539.7gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPD		 12,081.9gltr_CreationsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPD		  
Redemptions (in Ounces) (11,462.5)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPD		 (1,767.6)gltr_RedemptionsOuncesOfBullion
/ us-gaap_CurrencyAxis
= currency_XPD		  
Transfers of Bullion to pay expenses (in Ounces) (96.6)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XPD		 (88.6)gltr_TransfersOfBullionOunces
/ us-gaap_CurrencyAxis
= currency_XPD		  
Closing balance (in Ounces) 22,239.7us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPD		 23,259.1us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPD		  
Investment in Bullion, fair value, opening balance 16,538us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD		 8,315us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD		  
Investment in Bullion, lower of cost or market value, pening balance 15,984gltr_InvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPD		 [1],[2]    
Creations 8,457gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XPD		 8,904gltr_CreationsValueOfBullion
/ us-gaap_CurrencyAxis
= currency_XPD		  
Redemptions (8,415)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XPD		 (1,259)gltr_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable
/ us-gaap_CurrencyAxis
= currency_XPD		  
Realized (loss) / gain on Bullion transferred for redemptions 516gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XPD		 82gltr_RealizedGainLossOnBullionDistributedForRedemptionOfShares
/ us-gaap_CurrencyAxis
= currency_XPD		  
Transfers of Bullion to pay expenses (77)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPD		 (64)gltr_CostOfBullionTransferredToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPD		  
Realized gain / (loss) on Bullion transferred to pay expenses 10us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPD		 6us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses
/ us-gaap_CurrencyAxis
= currency_XPD		  
Unrealized gain / (loss) on investment in Bullion 718gltr_ChangeInUnrealizedGainLossOnInvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPD		    
Realized loss on investment in Bullion   0gltr_RealizedGainLossOnBullion
/ us-gaap_CurrencyAxis
= currency_XPD		  
Investment in Bullion, fair value, closing balance 17,747us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD		 [1],[4] 16,538us-gaap_InvestmentInPhysicalCommodities
/ us-gaap_CurrencyAxis
= currency_XPD		  
Investment in Bullion, lower of cost or market value, closing balance   $ 15,984gltr_InvestmentInBullion
/ us-gaap_CurrencyAxis
= currency_XPD		 [1],[2]  
[1] 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.
[2] Derived from audited Statement of Financial Condition as of December 31, 2013. The amounts are those previously reported under non-investment company accounting. Refer to Note 2.1 for further information.
[3] In accordance with Topic 946, Investment Companies, the Trust meets the exemption criteria to exclude a statement of cash flows. Thus one has not been presented for the year ended December 31, 2014. Refer to Note 2.1 for additional information.
[4] 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.
[5] Amounts are those previously reported under non investment company accounting.  Refer to Note 2.1 for additional information.