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Significant Accounting Policies (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Silver Payable At Market Value $ 0   $ 0   $ 8,392,292 [1]
Annualized Rate Of Sponsors Fee     0.45%    
Annualized Rate Of Sponsors Fee After Waiver     0.30%    
Sponsor Fees 397,875 520,410 848,762 930,293  
Accounts Payable, Related Parties, Current 116,358   116,358   140,160 [1]
Sponsor Fees Waived $ 198,938 $ 260,205 $ 424,381 $ 465,147  
[1] Derived from audited Statement of Financial Condition as of December 31, 2011.