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Trade Receivables - Summary of Changes in Provision for Doubtful Accounts (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Changes In Allowance For Doubtful Accounts [Abstract] |  |
Balance at beginning of year | € 5,604 | € 5,325
Charges – bad debt expense | 33 | 330
Reductions – write off of uncollectible amounts | (1,409) | (95)
Foreign exchange effect | 35 | 44
Balance at end of year | € 4,263 | € 5,604

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- Definition Allowance for doubtful accounts charges. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Allowance for doubtful accounts foreign exchange effect. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Allowance for doubtful accounts receivable1. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Allowance for doubtful accounts writeoff. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of changes in allowance for doubtful accounts [abstract] + References No definition available. + Details
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