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v3.19.1

Other Current Receivables - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018
Top of range [member] |
Disclosure Of Other Current Receivables [line items] |
Maturity of VAT collection | 2 years

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- Definition Disclosure Of Other Current Receivables [line items]. + References No definition available. + Details
Name: | ntz_DisclosureOfOtherCurrentReceivablesLineItems
Namespace Prefix: | ntz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maturity of value added tax collection. + References No definition available. + Details
Name: | ntz_MaturityOfValueAddedTaxCollection
Namespace Prefix: | ntz_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |