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Significant Accounting Policies (Detail) - Schedule of unrealized gains or losses on the Trust's gold holdings (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Investment in gold - average cost $ 1,450,117,976 [1] $ 1,376,845,277 [1],[2] $ 971,070,331
Unrealized gain on investment in gold 313,313,360 301,078,135  
Investment in gold - market value $ 1,763,431,336 $ 1,677,923,412 [2]  
[1] The market value of investment in gold at June 30, 2012 was $1,763,431,336 and at December 31, 2011 was $1,677,923,412.
[2] Derived from audited Statement of Financial Condition as of December 31, 2011.