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Bank loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Bank Loans [Abstract] |  |  |
Beginning balance | $ 96,215 | $ 55,000 | $ 285,302
New loans | 95,000 | 341,215 | 200,500
Disbursements | (95,000) | (300,000) | (442,957)
Sale of subsidiary | (1,215) | 0 | 0
Exchange difference | 0 | 0 | 12,155
Final balance | $ 95,000 | $ 96,215 | $ 55,000

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- Definition Represents the proceedings from new loans. + References No definition available. + Details
Name: | cik0001013131_AdditionsForBorrowings
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents decrease in borrowings due to sale of subsidiary. + References No definition available. + Details
Name: | cik0001013131_DecreaseInBorrowingsDueToSaleOfSubsidiary
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of disbursements. + References No definition available. + Details
Name: | cik0001013131_DisbursementsOfBorrowings
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | cik0001013131_DisclosureOfBankLoansAbstract
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of exchange differences pertaining to borrowings. + References No definition available. + Details
Name: | cik0001013131_ExchangeDifferenceOfBorrowings
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of current loans received and the current portion of non-current loans received. [Refer: Loans received] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_CurrentLoansReceivedAndCurrentPortionOfNoncurrentLoansReceived
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant