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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 |  |  |  |  |
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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 |  |  |  |  | $ 729,594 pplt_InvestmentInBullion |  |  |
Value at January 1, 2014 at fair value |  | 622,683 us-gaap_InvestmentInPhysicalCommodities | [1],[2] | 729,594 us-gaap_InvestmentInPhysicalCommodities | 729,594 us-gaap_InvestmentInPhysicalCommodities | [1],[3] | 716,880 us-gaap_InvestmentInPhysicalCommodities | 607,567 us-gaap_InvestmentInPhysicalCommodities
Gain / (loss) as a result of change in accounting treatment | $ 0 us-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.

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- Definition Total value of investment in bullion (Gold,Silver,Platinum,Palladium) received by the Trust in respect of the issuance of Shares at the lower of cost or market value as at the balance sheet date. + References No definition available. + Details
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- Definition Investments held in physical commodities, such as gold, silver, platinum, crude oil, coal, sugar, rice, wheat. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 + Details
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- Definition Amount of the effect of a change in accounting principle on net income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22499-107794 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22583-107794 + Details
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