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Related parties (Details Textual) - Sociedad Minera Cerro Verde S.A.A. [Member] - USD ($) | 12 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Related Party Explanatory [Line Items] |  |  |
Description of basis for determining transaction price and type of delivery |  | at a price based on the Metals Week Dealer Oxide price and under a delivery type known as CIF (cost, insurance and freight) |
Amounts payable, related party transactions |  | $ 13,681,000 | $ 34,266,000
Stock option benefits [Member] |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |
Amounts payable, related party transactions |  | 8,100,000 | 7.1
Freeport Minerals Corporation [Member] |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |
Amounts payable, related party transactions | [1] | $ 8,470,000 | 30,353,000
Copper concentrate [Member] | Freeport Minerals Corporation [Member] | Long-term contracts [member] | Bottom of range [member] |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |
Proportion of sales commitment made by entity, related party transactions |  | 70.00% |
Copper concentrate [Member] | Freeport Minerals Corporation [Member] | Long-term contracts [member] | Top of range [member] |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |
Proportion of sales commitment made by entity, related party transactions |  | 80.00% |
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% |
Used shovel [Member] |  |  |
Disclosure Of Related Party Explanatory [Line Items] |  |  |
Amounts payable, related party transactions |  |  | $ 22.3
[1] | Accounts payable to FMC as of December 31, 2017, is related to stock option benefits for US$8.1 million. The balance as of December 31, 2016, includes US$22.3 million for the purchase of used shovels and US$7.1 million of stock option benefits.

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