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Financial - risk management objectives and policies (Details 1) - 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 libor iterest rate	10.00%	10.00%	10.00%
Decrease in libor interest rate	(10.00%)	(10.00%)	(10.00%)
Libor interest rate increased effect on income	$ (227)	$ (677)	$ (333)
Libor interest rate decreased effect on income	$ 227	$ 677	$ 333

X

- Definition

The percentage of decrease in libor interest rate.

+ References

No definition available.

+ Details

Name:	cik0001013131_DecreaseInLiborInterestRate
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 percentage of increase in libor interest rate.

+ References

No definition available.

+ Details

Name:	cik0001013131_IncreaseInLiborIterestRate
Namespace Prefix:	cik0001013131_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of decrease in income due to decrease the libor interest rate.

+ References

No definition available.

+ Details

Name:	cik0001013131_LiborInterestRateDecreasedEffectOnIncome
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 libor interest rate.

+ References

No definition available.

+ Details

Name:	cik0001013131_LiborInterestRateIncreasedEffectOnIncome
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration