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Significant Accounting Policies (Detail) - Schedule of Investment in Bullion (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
oz
Jun. 30, 2011
Jun. 30, 2012
oz
Jun. 30, 2011
oz
Dec. 31, 2011
oz
Ounces of Bullion:          
Opening balance (in Ounces)     2,491,437.2 2,107,550.5 2,107,550.5
Creations (in Ounces)     56,516.5   1,704,672.4
Redemptions (in Ounces)     (226,207.9) [1]   (1,304,789.5)
Transfers of Bullion (in Ounces)     (7,277.2)   (15,996.2)
Closing balance (in Ounces) 2,314,468.6   2,314,468.6   2,491,437.2
Investment in Bullion (lower of cost or market):          
Opening balance     $ 183,189,249 [2],[3] $ 150,644,616 $ 150,644,616
Creations 0 50,640,859 4,726,778 104,271,834 147,490,582
Redemptions     (16,646,094)   (100,280,173) [4]
Transfers of Bullion (262,652) (309,859) (535,937) (543,222) (1,213,460)
Realized loss on investment in Bullion         (13,452,316)
Unrealized loss on investment in Bullion (3,380,221) (247,742) (3,380,221) (247,742)  
Closing balance 167,353,775 [2]   167,353,775 [2]   183,189,249 [2],[3]
Gold [Member]
          
Ounces of Bullion:          
Opening balance (in Ounces)     65,564.1 55,461.9 55,461.9
Creations (in Ounces)     1,487.3   44,859.8
Redemptions (in Ounces)     (5,952.8) [1]   (34,336.6)
Transfers of Bullion (in Ounces)     (191.5)   (421.0)
Closing balance (in Ounces) 60,907.1   60,907.1   65,564.1
Investment in Bullion (lower of cost or market):          
Opening balance     95,031,713 76,213,472 76,213,472
Creations     2,452,885   68,061,096
Redemptions     (8,635,389)   (48,650,097) [4]
Transfers of Bullion     (278,026)   (592,758)
Realized loss on investment in Bullion         0
Unrealized loss on investment in Bullion     0    
Closing balance 88,571,183   88,571,183   95,031,713
Silver [Member]
          
Ounces of Bullion:          
Opening balance (in Ounces)     2,404,018.4 2,033,601.3 2,033,601.3
Creations (in Ounces)     54,533.4   1,644,859.4
Redemptions (in Ounces)     (218,270.8) [1]   (1,259,007.4)
Transfers of Bullion (in Ounces)     (7,021.9)   (15,434.9)
Closing balance (in Ounces) 2,233,259.1   2,233,259.1   2,404,018.4
Investment in Bullion (lower of cost or market):          
Opening balance     67,745,237 54,148,351 54,148,351
Creations     1,743,432   61,734,789
Redemptions     (6,155,785)   (38,678,514) [4]
Transfers of Bullion     (198,188)   (462,550)
Realized loss on investment in Bullion         (8,996,839)
Unrealized loss on investment in Bullion     (2,658,043)    
Closing balance 60,476,653   60,476,653   67,745,237
Platinum [Member]
          
Ounces of Bullion:          
Opening balance (in Ounces)     8,741.9 7,395.0 7,395.0
Creations (in Ounces)     198.3   5,981.2
Redemptions (in Ounces)     (793.7) [1]   (4,578.2)
Transfers of Bullion (in Ounces)     (25.5)   (56.1)
Closing balance (in Ounces) 8,121.0   8,121.0   8,741.9
Investment in Bullion (lower of cost or market):          
Opening balance     12,072,539 12,716,653 12,716,653
Creations     325,217   10,720,634
Redemptions     (1,097,337)   (8,000,519) [4]
Transfers of Bullion     (35,337)   (97,854)
Realized loss on investment in Bullion         (3,266,375)
Unrealized loss on investment in Bullion     0    
Closing balance 11,265,082   11,265,082   12,072,539
Palladium [Member]
          
Ounces of Bullion:          
Opening balance (in Ounces)     13,112.8 11,092.3 11,092.3
Creations (in Ounces)     297.5   8,972.0
Redemptions (in Ounces)     (1,190.6) [1]   (6,867.3)
Transfers of Bullion (in Ounces)     (38.3)   (84.2)
Closing balance (in Ounces) 12,181.4   12,181.4   13,112.8
Investment in Bullion (lower of cost or market):          
Opening balance     8,339,760 7,566,140 7,566,140
Creations     205,244   6,974,063
Redemptions     (757,583)   (4,951,043) [4]
Transfers of Bullion     (24,386)   (60,298)
Realized loss on investment in Bullion         (1,189,102)
Unrealized loss on investment in Bullion     (722,178)    
Closing balance $ 7,040,857   $ 7,040,857   $ 8,339,760
[1] Market value of Bullion payable at December 31, 2011 - $4,689,743, $3,077,647, $548,453 and $378,873, respectively.
[2] Bullion is valued at the lower of cost or market value. Refer to Note 2.1 for a breakdown of market value per metal.
[3] Derived from audited Statement of Financial Condition as of December 31, 2011.
[4] Market value of Bullion payable at June 30, 2012 - $2,373,501, $1,474,337, $282,711 and $171,646, respectively.