Schedule of Investments (Details) - Investments (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014 oz		Dec. 31, 2013 oz	Dec. 31, 2012 oz	Dec. 31, 2011 oz
Investments [Abstract]
Silver bullion (in Ounces)	329,564,200	[1]	320,177,800	324,239,100	308,833,300
Silver bullion	$ 6,386,750	[1]	$ 6,243,467
Silver bullion	$ 5,263,140	[1],[2]	$ 6,243,467
Silver bullion	100.04%	[1]

[1] Effective January 1, 2014, the Trust qualifies as an investment company for accounting purposes. Disclosure of a schedule of investments is required for investment companies. Please refer to Note 2B.

[2] Presented at fair value at December 31, 2014 (cost: $6,386,750).