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Contractual obligations (Details Narrative) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($)
Contractual Obligations |
Upfront payment for silver streaming arrangement | $ 250,000
Payable silver equivalent | 10.00%
Sale silver streaming arrangement | $ 19,500
Payable silver content | 25.00%

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

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- Definition The element represents payable silver content percentage + References No definition available. + Details
Name: | nexa_PayableSilverContentPercentage
Namespace Prefix: | nexa_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The element represents payable silver equivalent percentage + References No definition available. + Details
Name: | nexa_PayableSilverEquivalentPercentage
Namespace Prefix: | nexa_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents sale silver streaming arrangement + References No definition available. + Details
Name: | nexa_SaleSilverStreamingArrangement
Namespace Prefix: | nexa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The element represents upfront payment for silver streaming arrangement. + References No definition available. + Details
Name: | nexa_UpfrontPaymentForSilverStreamingArrangement
Namespace Prefix: | nexa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration