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Fair Value Measurements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Balance at beginning of year | $ 1,026,685 |
Realized gains (losses) on sales and redemptions for physical bullion | 759 | $ (16,398)
Change in unrealized gains (losses) | (1,026,156) | (455,536)
Balance at end of year | 1,594,588 | 1,026,685
Physical gold bullion cost | 2,100,112 | 1,706,026
Physical silver bullion cost | 1,036,069 | 993,993
Recurring fair value measurement |  |
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Balance at beginning of year | 2,959,687 | 2,808,052
Purchases | 440,262 |
Sales | (5,043) | (23,265)
Redemptions for physical bullion | 184 | (264,238)
Realized gains (losses) on sales and redemptions for physical bullion | 759 | (16,398)
Change in unrealized gains (losses) | 1,026,156 | 455,536
Balance at end of year | $ 4,422,005 | $ 2,959,687

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- Definition The amount of current silver bullion assets. + References No definition available. + Details
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- Definition Represents the net realized gains (losses) on redemptions/sales of bullion. + References No definition available. + Details
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- Definition The cost of physical gold bullion as on the balance sheet date. + References No definition available. + Details
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- Definition The cost of physical silver bullion as on the balance sheet date. + References No definition available. + Details
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- Definition The decrease in the fair value measurement of bullion holdings resulting from redemptions for physical bullion. + References No definition available. + Details
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- Definition The gains (losses) recognised in profit or loss for assets measured at fair value that are attributable to the change in unrealised gains or losses relating to those assets held at the end of the reporting period. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease in the fair value measurement of assets resulting from sales. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2020-01-01 + Details
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