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Statements of Assets and Liabilities (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Investment Company [Abstract]    
Investment in gold at cost $ 2,045,614 $ 2,135,209
Common stock, shares authorized Unlimited Unlimited
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares issued 139,400,000 146,200,000
Common stock, shares outstanding 139,400,000 146,200,000
Net asset value per share (in dollars per share) $ 16.25 $ 18.14