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Embedded derivatives (Details Textual) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Of Embedded derivatives [Abstract] |  |
Trade account receivable due from related parties | $ 19.3 | $ 65.6
Trade accounts receivable net | $ 0.8 | $ 3.1

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

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- Definition Trade account receivable due from related parties. + References No definition available. + Details
Name: | cik0001013131_TradeAccountReceivableDueFromRelatedParties
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Trade accounts receivable (net). + References No definition available. + Details
Name: | cik0001013131_TradeAccountsReceivablenet
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant