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Other Income and Other Expense - Additional information (Detail) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of other income and expenses [abstract] |  |
Provisions for legal claims released | € 1,700 |
VAT relief | € 1,392 |
Litigation settlements |  | € 1,650

X
- Definition The gains (losses) on settlements of litigation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 98 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_98_f&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure of other income and expenses [abstract] + References No definition available. + Details
Name: | ntz_DisclosureOfOtherIncomeAndExpensesAbstract
Namespace Prefix: | ntz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Provision for value added tax losses. + References No definition available. + Details
Name: | ntz_ProvisionForValueAddedTaxLosses
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of released provisions. + References No definition available. + Details
Name: | ntz_ReleasedProvisions
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration