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Significant Accounting Policies (Schedule Of Unrealized Gains Or Losses On The Trust's Gold Holdings) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Significant Accounting Policies [Abstract]      
Investment in gold - average cost $ 1,555,077 [1] $ 1,561,925 [1],[2] $ 1,376,845
Unrealized gain on investment in gold 289,660 368,762  
Investment in gold - market value $ 1,844,737 $ 1,930,687  
[1] The investment in gold is valued at the lower of cost or market. Refer to note 2.1 for a breakdown of cost and market value of the investment in gold.
[2] Derived from audited Statement of Financial Condition as of December 31, 2012.