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Significant Accounting Policies (Quantitative Effect Of Adoption Of Investment Company Accounting) (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended
Jan. 01, 2014
Dec. 31, 2014
Jan. 01, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Significant Accounting Policies [Abstract]            
Value at December 31, 2013 at lower of cost or market value       $ 729,594pplt_InvestmentInBullion    
Value at January 1, 2014 at 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
Gain / (loss) as a result of change in accounting treatment $ 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome          
[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.