Early Deposit Mineral Stream Interests - Summary of Early Deposit Mineral Stream Interests (Parenthetical) (Detail)	12 Months Ended
Dec. 31, 2020 oz
Cotabambas [member]
Disclosure Of Mineral Stream Interests [line items]
Percentage of silver production at the mine which WPM is entitled to after step down	66.67%
Percentage of gold production at the mine which WPM is entitled to after step down	16.67%
Kutcho [member]
Disclosure Of Mineral Stream Interests [line items]
Percentage of silver production at the mine which WPM is entitled to after step down	66.67%
Gold [member] \| Kutcho [member]
Disclosure Of Mineral Stream Interests [line items]
Gold ounces to be delivered before entitlement step down takes effect	51,000
Silver [member] \| Cotabambas [member]
Disclosure Of Mineral Stream Interests [line items]
Silver Equivalent ounces to be delivered before entitlement step down takes effect	90,000,000
Silver [member] \| Kutcho [member]
Disclosure Of Mineral Stream Interests [line items]
Silver ounces to be delivered before entitlement step down takes effect	5,600,000

Disclosure of mineral stream interests [line items]

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Gold ounces to be delivered before entitlement step down takes effect.

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Percentage of gold production at the mine which WPM is entitled to after step down.

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Percentage of silver production at the mine which WPM is entitled to after step down.

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Silver Equivalent ounces to be delivered before entitlement step down takes effect.

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Silver ounces to be delivered before entitlement step down takes effect.

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