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Risk Management Activities - Credit Risk - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Loan Advanced Contractor [Member] | Lifetime expected credit losses [member] |  |
Disclosure of Financial Risk Management [line items] |  |
Financial assets | $ 68.4 |
Peru [member] |  |
Disclosure of Financial Risk Management [line items] |  |
Percentage Of Cash Receipts On Revenue Recognition | 90.00% | 90.00%
Percentage Of Cash Receipts At The End Of Quotation Period | 10.00% | 10.00%
Counter party exposure [member] |  |
Disclosure of Financial Risk Management [line items] |  |
Percentage of maximum investment in financial institutions' equity | 2.50% | 2.50%

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