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Financial - risk management objectives and policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial risk management objectives and policies [Line Items]
Increase in exchange rate basis points	10.00%	10.00%	10.00%
Decrease in exchange rate basis points	(10.00%)	(10.00%)	(10.00%)
Exchange rate increased effect on income	$ 1,695	$ 2,474	$ (924)
Exchange rate decreased effect on income	$ (1,681)	$ (2,459)	$ 926

X

- Definition

The percentage of decrease in exchange rate basis points.

+ References

No definition available.

+ Details

Name:	cik0001013131_DecreaseInExchangeRateBasisPoints
Namespace Prefix:	cik0001013131_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	cik0001013131_DisclosureOfFinancialRiskManagementObjectivesAndPoliciesLineItems
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of decrease in income due to decrease the basis points in exchange rate.

+ References

No definition available.

+ Details

Name:	cik0001013131_ExchangeRateDecreasedEffectOnIncome
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of increase in income due to Increase the basis points in exchange rate.

+ References

No definition available.

+ Details

Name:	cik0001013131_ExchangeRateIncreasedEffectOnIncome
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The percentage of increase in exchange rate basis points.

+ References

No definition available.

+ Details

Name:	cik0001013131_IncreaseInExchangeRateBasisPoints
Namespace Prefix:	cik0001013131_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant