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Trade and other receivables, net (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Trade and other receivables, net [Line Items]
Beginning balance	$ 31,607	$ 26,520	$ 25,636
Provision of the period	676	5,087	903
Reversals of the period	(99)	0	(19)
Final balance	32,184	31,607	26,520
Trade receivables, net ,Allowance for doubtful accounts	(22,823)	(22,644)	21,741
Other receivables, Allowance for doubtful accounts	$ 9,361	$ (8,963)	$ 4,779

X

- Definition

Represents the valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

No definition available.

+ Details

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Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of allowance of receivables classified as other receivables.

+ References

No definition available.

+ Details

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Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of allowance of receivables classified as trade receivables.

+ References

No definition available.

+ Details

Name:	cik0001013131_AllowanceForDoubtfulTradeReceivables
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	cik0001013131_DisclosureOfTradeAndOtherReceivablesNetLineItems
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the reversal of provision for doubtful accounts.

+ References

No definition available.

+ Details

Name:	cik0001013131_ReversalOfProvisionForDoubtfulAccounts
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.5)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration