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Significant Accounting Policies (Schedule Of Unrealized Gains Or Losses On The Trust's Platinum Holdings) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jan. 01, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Significant Accounting Policies [Abstract]          
Investment in platinum - cost $ 699,924us-gaap_InvestmentOwnedAtCost   $ 729,594us-gaap_InvestmentOwnedAtCost    
Unrealized loss on investment in platinum (77,241)pplt_UnrealizedGainLossOnInvestmentInBullion   0pplt_UnrealizedGainLossOnInvestmentInBullion    
Investment in platinum - fair value $ 622,683us-gaap_InvestmentInPhysicalCommodities [1],[2] $ 729,594us-gaap_InvestmentInPhysicalCommodities $ 729,594us-gaap_InvestmentInPhysicalCommodities [1],[3] $ 716,880us-gaap_InvestmentInPhysicalCommodities $ 607,567us-gaap_InvestmentInPhysicalCommodities
[1] At December 31, 2014, the investment in platinum is valued at fair value. At December 31, 2013 the investment in platinum 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 platinum.
[2] 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.
[3] 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 additional information.