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Related parties - Additional Information (Details) - Sociedad Minera Cerro Verde S.A.A. [Member] $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Disclosure Of Related Party Explanatory [Line Items] |  |  |  |
Description of basis for determining transaction price and type of delivery |  | at a price based on MWDO and under a delivery type known as CIF (cost, insurance and freight) |  |
Amounts receivable, related party transactions |  | $ 594,409 | $ 453,070 |
Benefits derived to key managerial personnel, Percentage |  | 0.45 | 0.42 |
Related payments/vesting |  | $ 400 | $ 800 | $ 500
Stock-based compensation |  |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |  |
Related payments/vesting |  | 2,300 | 1,600 | 1,200
Other capital contributions |  |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |  |
Net impact in "Other capital contributions" |  | 1,500 | 1,200 | $ 700
Freeport Minerals Corporation [Member] |  |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |  |
Amounts payable, related party transactions |  | 0 | 367 |
Amounts receivable, related party transactions | [1] | 462,304 | 401,211 |
Sumitomo Metal Mining Company, Ltd. [Member] |  |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |  |
Amounts receivable, related party transactions | [2] | 16,352 | 10,760 |
Climax Molybdenum Marketing Corporation [Member] |  |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |  |
Amounts receivable, related party transactions | [3] | $ 14,319 | $ 5,022 |
Copper concentrate [Member] | Sumitomo Metal Mining Company, Ltd. [Member] | Long-term contracts [member] |  |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |  |
Proportion of sales commitment made by entity, related party transactions |  | 21.00% |  |
Molybdenum concentrate [Member] | Climax Molybdenum Marketing Corporation [Member] | Long-term contracts [member] |  |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |  |
Proportion of sales commitment made by entity, related party transactions |  | 100.00% |  |
Minimum | Copper concentrate [Member] | Freeport Minerals Corporation [Member] | Long-term contracts [member] |  |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |  |
Proportion of sales commitment made by entity, related party transactions |  | 70.00% |  |
Maximum | Copper concentrate [Member] | Freeport Minerals Corporation [Member] | Long-term contracts [member] |  |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |  |
Proportion of sales commitment made by entity, related party transactions |  | 80.00% |  |
[1] | Accounts receivable from FMC mainly correspond to sales of copper concentrate and copper cathode. The Company has a long-term agreement with FMC through which it has committed to sell between 70% and 80% of its annual copper concentrate production through December 31, 2021. Terms of the contract are reviewed annually.
[2] | The Company has a long-term agreement with Sumitomo through which it has committed to sell 21% of its annual copper concentrate production through December 31, 2021. Terms of the contract are reviewed annually.
[3] | The Company has a new long-term agreement with Climax Molybdenum Marketing Corporation (a wholly owned subsidiary of FMC) through which it has committed to sell 100% of its annual molybdenum concentrate production, at a price based on MWDO and under a delivery type known as CIF (cost, insurance and freight) from February 1, 2020, through January 31, 2022.

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