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Other, net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Other net [Line Items]      
Other operating incomes $ 102,620 $ 87,828 $ 95,307
Other Operating Expense (107,632) (101,417) (76,350)
Profit (loss) for the year (11,654) 64,435 (327,814)
Disposal Cost Of Sale Of Supplies And Merchandise To Third Parties [Member]      
Disclosure of Other net [Line Items]      
Other Operating Expense (57,897) (60,242) (49,890)
Net Cost Of Transfer Of Investments [Member]      
Disclosure of Other net [Line Items]      
Other Operating Expense (11,178) (1,706) 0
Direct Expenses [Member]      
Disclosure of Other net [Line Items]      
Other Operating Expense (11,000) (5,998) (4,350)
Provision For Loss Of Value Of Supplies [Member]      
Disclosure of Other net [Line Items]      
Other Operating Expense (7,039) (2,444) 0
Withdrawals And Disposals Of Property Machinery And Equipment [Member]      
Disclosure of Other net [Line Items]      
Other Operating Expense (6,626) (15,013) (1,635)
Allowance For Expected Credit Losses [Member]      
Disclosure of Other net [Line Items]      
Other Operating Expense (1,334) 0 0
Net Cost Of Property Machinery And Equipment To Third Parties [Member]      
Disclosure of Other net [Line Items]      
Other Operating Expense (626) 0 (2,131)
Net Cost Of Investment Properties [Member]      
Disclosure of Other net [Line Items]      
Other Operating Expense [1] 0 (9,575) 0
Changes In Provision For Exploration Projects [Member]      
Disclosure of Other net [Line Items]      
Other Operating Expense 0 (891) 0
Other minor expenses [Member]      
Disclosure of Other net [Line Items]      
Other Operating Expense (11,932) (5,548) (18,344)
Insurance Claim Recovery [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes 33,735 1,190 2,936
Sale Of Supplies And Merchandise To Third Parties [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes 46,136 54,505 50,973
Sale Of Investment In Subsidiary [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes 7,097 0 0
Changes In Provisions For Exploration Projects [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes 2,433 0 0
Sale Of Assets To Third Parties [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes 3,863 369 21,730
Sale Of Services To Third Parties [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes 3,512 2,566 1,840
Income From Previous Years [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes 1,517 2,737 1,086
Recovery Of Expenses From Previous Years [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes 81 68 3,171
Income From Rental Of Investment Properties [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes 45 235 1,821
Expiration Of Allowance For Expected Credit Losses [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes 45 99 0
Sale of assets to related parties [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes 30 336 0
Sale Of Supplies Related Parties [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes 27 4 1
Sale Of Investment Properties [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes [1] 0 11,250 0
Recovery Of Provision For Depreciation Of Supplies [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes 0 0 110
Other Minor Income [Member]      
Disclosure of Other net [Line Items]      
Other operating incomes $ 4,099 $ 14,469 $ 11,639
[1] During 2017 the subsidiary Buenaventura Ingenieros S.A. (hereinafter "BISA") sold to a third party its investment properties located in the El Derby Capital Building, district of Surco.