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Selling Expenses - Additional Information (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Selling Expenses [Abstract] |  |
Lease incentives | € 1,515 | € 1,799

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- Definition Abstract represents disclosure of selling expenses. + References No definition available. + Details
Name: | ntz_DisclosureOfSellingExpensesAbstract
Namespace Prefix: | ntz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease incentive. + References No definition available. + Details
Name: | ntz_LeaseIncentive
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration