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Significant Accounting Policies (Schedule Of Redeemable Capital Shares) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Significant Accounting Policies [Abstract]      
Opening balance (in Shares) 5,400,000us-gaap_CommonStockSharesIssued 5,150,000us-gaap_CommonStockSharesIssued 4,450,000us-gaap_CommonStockSharesIssued
Creations (in Shares) 350,000us-gaap_StockIssuedDuringPeriodSharesNewIssues [1] 1,400,000us-gaap_StockIssuedDuringPeriodSharesNewIssues 1,800,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
Redemptions (in Shares) (550,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares [1] (1,150,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares (1,100,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares
Closing balance (in Shares) 5,200,000us-gaap_CommonStockSharesIssued 5,400,000us-gaap_CommonStockSharesIssued 5,150,000us-gaap_CommonStockSharesIssued
Opening balance $ 715,960us-gaap_CommonStockValue $ 770,400us-gaap_CommonStockValue $ 607,263us-gaap_CommonStockValue
Creations 47,428us-gaap_StockIssuedDuringPeriodValueNewIssues [1] 210,808us-gaap_StockIssuedDuringPeriodValueNewIssues 274,782us-gaap_StockIssuedDuringPeriodValueNewIssues
Redemptions (69,738)us-gaap_StockRedeemedOrCalledDuringPeriodValue [1] (162,799)us-gaap_StockRedeemedOrCalledDuringPeriodValue (174,638)us-gaap_StockRedeemedOrCalledDuringPeriodValue
Adjustment to redemption value   (102,449)pplt_AdjustmentOfRedeemableSharesToRedemptionValue [1] 62,993pplt_AdjustmentOfRedeemableSharesToRedemptionValue [1]
Closing balance   $ 715,960us-gaap_CommonStockValue $ 770,400us-gaap_CommonStockValue
Redemption value per Share at period end (in Dollars per share)   $ 132.59pplt_RedemptionValuePerShareAtPeriodEnd $ 149.59pplt_RedemptionValuePerShareAtPeriodEnd
[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.