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Significant Accounting Policies (Detail) - Schedule of unrealized gains or losses on the Trust's palladium holdings (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Investment in palladium-average cost $ 478,569,021 [1]   $ 478,569,021 [1]   $ 351,083,261 [1],[2] $ 597,199,695
Unrealized (loss) / gain on investment in palladium (37,846,898) 0 (37,846,898) 0 23,047,309  
Investment in palladium-market value $ 516,415,919   $ 516,415,919   $ 374,130,570 [2]  
[1] The cost of investment in palladium at June 30, 2012 was $516,415,919 and at December 31, 2011 the market value was $374,130,570.
[2] Derived from audited Statement of Financial Condition as of December 31, 2011.