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Schedule of Investments (oz, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Investment in Bullion (oz) 4,225,571.5us-gaap_InvestmentOwnedBalanceOtherMeasure 4,419,242.6us-gaap_InvestmentOwnedBalanceOtherMeasure
Cost $ 242,403us-gaap_InvestmentOwnedAtCost $ 259,922us-gaap_InvestmentOwnedAtCost
Fair Value 234,158us-gaap_InvestmentOwnedAtFairValue 260,476us-gaap_InvestmentOwnedAtFairValue
% of Net Assets 98.74%us-gaap_InvestmentOwnedPercentOfNetAssets [1] 100.05%us-gaap_InvestmentOwnedPercentOfNetAssets [2]
Gold [Member]    
Investment Holdings [Line Items]    
Investment in Bullion (oz) 111,199.3us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAU		 116,295.9us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAU
Cost 133,156us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XAU		 139,729us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XAU
Fair Value 133,356us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_CurrencyAxis
= currency_XAU		 139,729us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_CurrencyAxis
= currency_XAU
% of Net Assets 56.23%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_CurrencyAxis
= currency_XAU		 [1] 53.78%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_CurrencyAxis
= currency_XAU		 [2]
Silver [Member]    
Investment Holdings [Line Items]    
Investment in Bullion (oz) 4,077,306.0us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAG		 4,264,181.5us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XAG
Cost 73,612us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XAG		 83,152us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XAG
Fair Value 65,115us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_CurrencyAxis
= currency_XAG		 83,152us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_CurrencyAxis
= currency_XAG
% of Net Assets 27.46%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_CurrencyAxis
= currency_XAG		 [1] 32.01%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_CurrencyAxis
= currency_XAG		 [2]
Platinum [Member]    
Investment Holdings [Line Items]    
Investment in Bullion (oz) 14,826.5us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPT		 15,506.1us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPT
Cost 19,160us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPT		 21,057us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPT
Fair Value 17,940us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_CurrencyAxis
= currency_XPT		 21,057us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_CurrencyAxis
= currency_XPT
% of Net Assets 7.56%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_CurrencyAxis
= currency_XPT		 [1] 8.10%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_CurrencyAxis
= currency_XPT		 [2]
Palladium [Member]    
Investment Holdings [Line Items]    
Investment in Bullion (oz) 22,239.7us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPD		 23,259.1us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPD
Cost 16,475us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPD		 15,984us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPD
Fair Value $ 17,747us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_CurrencyAxis
= currency_XPD		 $ 16,538us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_CurrencyAxis
= currency_XPD
% of Net Assets 7.48%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_CurrencyAxis
= currency_XPD		 [1] 6.15%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_CurrencyAxis
= currency_XPD		 [2]
[1] Calculated as investment in Bullion at fair value divided by net assets, as at December 31, 2014, investment in Bullion is recorded at fair value. Refer to Note 2.1 for additional information.
[2] Calculated as investment in Bullion at cost divided by net assets, as at December 31, 2013, investment in Bullion was recorded at the lower of cost or market value. Refer to Note 2.1 for additional information.