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Significant Accounting Policies (Detail) - Schedule of Investment in Gold (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 gold          
Opening balance     1,065,686.5 821,051.2 821,051.2
Creations     64,366.6   292,915.5
Redemptions     (24,749.8)   (44,662.3)
Transfers of gold     (2,124.5)   (3,617.9)
Closing balance 1,103,178.8   1,103,178.8   1,065,686.5
Investment in gold (lower of cost or market value)          
Opening balance (in Dollars)     $ 1,376,845,277 [1],[2] $ 971,070,331 $ 971,070,331
Creations (in Dollars) 22,855,339 30,215,575 108,504,553 154,351,243 466,052,746
Redemptions (in Dollars) (12,979,422) 0 (32,457,286) (11,762,856) (55,843,669)
Transfers of gold (in Dollars) (1,416,336) (1,052,200) (2,774,568) (1,998,403) (4,434,131)
Closing balance (in Dollars) $ 1,450,117,976 [1]   $ 1,450,117,976 [1]   $ 1,376,845,277 [1],[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.