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Significant Accounting Policies (Schedule Of Unrealized Gains Or Losses On The Trust's Palladium Holdings) (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Significant Accounting Policies [Abstract]      
Investment in palladium - average cost $ 494,491,065 [1] $ 351,083,261 [1],[2] $ 597,199,695
Unrealized gain on investment in palladium 14,157,292 23,047,309  
Investment in palladium - market value $ 508,648,357 $ 374,130,570  
[1] The investment in palladium is valued at the lower of cost or market value. Refer to note 2.1 for a breakdown of cost and market value of the investment in palladium.
[2] Derived from audited Statement of Financial Condition as of December 31, 2011.