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Commitments and Contingent Liabilities - Additional information (Detail) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Guarantees [member] |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |
Contingent liability | € 6,770 | € 1,620

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- Definition The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2019-01-01 -Paragraph 86 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_86_a&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | ifrs-full_ClassesOfContingentLiabilitiesAxis=ifrs-full_ContingentLiabilityForGuaranteesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |