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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
oz
Sep. 30, 2012
Sep. 30, 2013
oz
Sep. 30, 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)     617,590.1   281,804.6
Redemptions (in Ounces)     (56,118.7)   (282,631.4)
Transfers of Bullion to pay expenses (in Ounces)     (12,363.1)   (14,253.3)
Closing balance (in Ounces) 3,025,465.4   3,025,465.4   2,476,357.1
Opening balance     $ 185,427,000 $ 183,189,000 $ 183,189,000
Creations 11,104,000 4,620,000 46,180,000 9,346,000 24,100,000
Redemptions     (4,237,000)   (20,809,000)
Transfers of Bullion to pay expenses (329,000) (254,000) (931,000) (790,000) (1,053,000)
Unrealized loss on investment in Bullion 18,807,000 3,380,000 (32,102,000) 0  
Closing balance 194,337,000   194,337,000   185,427,000
Bullion payable at market value 0   0   0
Bullion receivable at market value 0   0   0
Gold [Member]
          
Bullion [Line Items]          
Opening balance (in Ounces)     65,167.3 65,564.1 65,564.1
Creations (in Ounces)     16,252.4   7,415.9
Redemptions (in Ounces)     (1,476.8)   (7,437.6)
Transfers of Bullion to pay expenses (in Ounces)     (325.3)   (375.1)
Closing balance (in Ounces) 79,617.6   79,617.6   65,167.3
Opening balance     96,337,000 95,032,000 95,032,000
Creations     24,569,000   12,647,000
Redemptions     (2,207,000)   (10,795,000)
Transfers of Bullion to pay expenses     (485,000)   (547,000)
Unrealized loss on investment in Bullion     (12,601,000)    
Closing balance 105,613,000   105,613,000   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)     595,920.3   271,916.7
Redemptions (in Ounces)     (54,149.7)   (272,714.5)
Transfers of Bullion to pay expenses (in Ounces)     (11,929.4)   (13,753.2)
Closing balance (in Ounces) 2,919,308.6   2,919,308.6   2,389,467.4
Opening balance     68,562,000 67,745,000 67,745,000
Creations     15,871,000   8,902,000
Redemptions     (1,555,000)   (7,695,000)
Transfers of Bullion to pay expenses     (342,000)   (390,000)
Unrealized loss on investment in Bullion     (19,246,000)    
Closing balance 63,290,000   63,290,000   68,562,000
Platinum [Member]
          
Bullion [Line Items]          
Opening balance (in Ounces)     8,689.0 8,741.9 8,741.9
Creations (in Ounces)     2,167.0   988.8
Redemptions (in Ounces)     (196.9)   (991.7)
Transfers of Bullion to pay expenses (in Ounces)     (43.4)   (50.0)
Closing balance (in Ounces) 10,615.7   10,615.7   8,689.0
Opening balance     12,213,000 12,072,000 12,072,000
Creations     3,365,000   1,582,000
Redemptions     (282,000)   (1,372,000)
Transfers of Bullion to pay expenses     (62,000)   (69,000)
Unrealized loss on investment in Bullion     (255,000)    
Closing balance 14,979,000   14,979,000   12,213,000
Palladium [Member]
          
Bullion [Line Items]          
Opening balance (in Ounces)     13,033.4 13,112.8 13,112.8
Creations (in Ounces)     3,250.4   1,483.2
Redemptions (in Ounces)     (295.3)   (1,487.6)
Transfers of Bullion to pay expenses (in Ounces)     (65.0)   (75.0)
Closing balance (in Ounces) 15,923.5   15,923.5   13,033.4
Opening balance     8,315,000 8,340,000 8,340,000
Creations     2,375,000   969,000
Redemptions     (193,000)   (947,000)
Transfers of Bullion to pay expenses     (42,000)   (47,000)
Unrealized loss on investment in Bullion     0    
Closing balance $ 10,455,000   $ 10,455,000   $ 8,315,000