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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
oz
Dec. 31, 2012
oz
Dec. 31, 2011
oz
Bullion [Line Items]      
Opening balance (in Ounces) 2,476,357.1 2,491,437.2  
Creations (in Ounces) 2,295,568.0 281,804.6  
Redemptions (in Ounces) (335,841.4) (282,631.4)  
Transfers of Bullion to pay expenses (in Ounces) (16,841.1) (14,253.3)  
Closing balance (in Ounces) 4,419,242.6 2,476,357.1 2,491,437.2
Opening balance $ 185,427 $ 183,189  
Creations 149,236 24,100 147,490
Redemptions (24,617) (20,809)  
Transfers of Bullion to pay expenses (1,266) (1,053) (1,213)
Realized loss on investment in Bullion (48,858)    
Closing balance 259,922 185,427 183,189
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  
Creations (in Ounces) 60,409.7 7,415.9  
Redemptions (in Ounces) (8,837.9) (7,437.6)  
Transfers of Bullion to pay expenses (in Ounces) (443.2) (375.1)  
Closing balance (in Ounces) 116,295.9 65,167.3  
Opening balance 96,337 95,032  
Creations 80,050 12,647  
Redemptions (12,888) (10,795)  
Transfers of Bullion to pay expenses (660) (547)  
Realized loss on investment in Bullion (23,110)    
Closing balance 139,729 96,337  
Silver [Member]
      
Bullion [Line Items]      
Opening balance (in Ounces) 2,389,467.4 2,404,018.4  
Creations (in Ounces) 2,215,021.8 271,916.7  
Redemptions (in Ounces) (324,057.5) (272,714.5)  
Transfers of Bullion to pay expenses (in Ounces) (16,250.2) (13,753.2)  
Closing balance (in Ounces) 4,264,181.5 2,389,467.4  
Opening balance 68,562 67,745  
Creations 48,772 8,902  
Redemptions (8,869) (7,695)  
Transfers of Bullion to pay expenses (464) (390)  
Realized loss on investment in Bullion (24,849)    
Closing balance 83,152 68,562  
Platinum [Member]
      
Bullion [Line Items]      
Opening balance (in Ounces) 8,689.0 8,741.9  
Creations (in Ounces) 8,054.6 988.8  
Redemptions (in Ounces) (1,178.4) (991.7)  
Transfers of Bullion to pay expenses (in Ounces) (59.1) (50.0)  
Closing balance (in Ounces) 15,506.1 8,689.0  
Opening balance 12,213 12,072  
Creations 11,510 1,582  
Redemptions (1,683) (1,372)  
Transfers of Bullion to pay expenses (84) (69)  
Realized loss on investment in Bullion (899)    
Closing balance 21,057 12,213  
Palladium [Member]
      
Bullion [Line Items]      
Opening balance (in Ounces) 13,033.4 13,112.8  
Creations (in Ounces) 12,081.9 1,483.2  
Redemptions (in Ounces) (1,767.6) (1,487.6)  
Transfers of Bullion to pay expenses (in Ounces) (88.6) (75.0)  
Closing balance (in Ounces) 23,259.1 13,033.4  
Opening balance 8,315 8,340  
Creations 8,904 969  
Redemptions (1,177) (947)  
Transfers of Bullion to pay expenses (58) (47)  
Realized loss on investment in Bullion 0    
Closing balance $ 15,984 $ 8,315