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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
oz
Mar. 31, 2012
oz
Dec. 31, 2012
oz
Bullion [Line Items]      
Opening balance (in Ounces) 2,476,357.1 2,491,437.2 2,491,437.2
Creations (in Ounces) 281,038.3   281,804.6
Redemptions (in Ounces)     (282,631.4)
Transfers of Bullion to pay expenses (in Ounces) (3,757.5)   (14,253.3)
Closing balance (in Ounces) 2,753,637.9   2,476,357.1
Opening balance $ 185,427,000 [1],[2] $ 183,189,000 $ 183,189,000
Creations 23,125,000 4,727,000 24,100,000
Redemptions     (20,809,000)
Transfers of Bullion to pay expenses (282,000) (273,000) (1,053,000)
Unrealized loss on investment in Bullion (617,000) 0  
Closing balance 207,653,000 [1]   185,427,000 [1],[2]
Bullion payable at market value 0   0
Bullion receivable at market value 0   0
Gold [Member]
      
Bullion [Line Items]      
Opening balance (in Ounces) 65,167.3 65,564.1 65,564.1
Creations (in Ounces) 7,395.7   7,415.9
Redemptions (in Ounces)     (7,437.6)
Transfers of Bullion to pay expenses (in Ounces) (98.9)   (375.1)
Closing balance (in Ounces) 72,464.1   65,167.3
Opening balance 96,337,000 95,032,000 95,032,000
Creations 12,167,000   12,647,000
Redemptions     (10,795,000)
Transfers of Bullion to pay expenses (146,000)   (547,000)
Unrealized loss on investment in Bullion 0    
Closing balance 108,358,000   96,337,000
Silver [Member]
      
Bullion [Line Items]      
Opening balance (in Ounces) 2,389,467.4 2,404,018.4 2,404,018.4
Creations (in Ounces) 271,177.3   271,916.7
Redemptions (in Ounces)     (272,714.5)
Transfers of Bullion to pay expenses (in Ounces) (3,625.6)   (13,753.2)
Closing balance (in Ounces) 2,657,019.1   2,389,467.4
Opening balance 68,562,000 67,745,000 67,745,000
Creations 8,255,000   8,902,000
Redemptions     (7,695,000)
Transfers of Bullion to pay expenses (104,000)   (390,000)
Unrealized loss on investment in Bullion (617,000)    
Closing balance 76,096,000   68,562,000
Platinum [Member]
      
Bullion [Line Items]      
Opening balance (in Ounces) 8,689.0 8,741.9 8,741.9
Creations (in Ounces) 986.1   988.8
Redemptions (in Ounces)     (991.7)
Transfers of Bullion to pay expenses (in Ounces) (13.2)   (50.0)
Closing balance (in Ounces) 9,661.9   8,689.0
Opening balance 12,213,000 12,072,000 12,072,000
Creations 1,607,000   1,582,000
Redemptions     (1,372,000)
Transfers of Bullion to pay expenses (19,000)   (69,000)
Unrealized loss on investment in Bullion 0    
Closing balance 13,801,000   12,213,000
Palladium [Member]
      
Bullion [Line Items]      
Opening balance (in Ounces) 13,033.4 13,112.8 13,112.8
Creations (in Ounces) 1,479.2   1,483.2
Redemptions (in Ounces)     (1,487.6)
Transfers of Bullion to pay expenses (in Ounces) (19.8)   (75.0)
Closing balance (in Ounces) 14,492.8   13,033.4
Opening balance 8,315,000 8,340,000 8,340,000
Creations 1,096,000   969,000
Redemptions     (947,000)
Transfers of Bullion to pay expenses (13,000)   (47,000)
Unrealized loss on investment in Bullion 0    
Closing balance $ 9,398,000   $ 8,315,000
[1] Bullion is valued at the lower of cost or market value. Refer to Note 2.1 for a breakdown of market value per metal.
[2] Derived from audited Statement of Financial Condition as of December 31, 2012.