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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, 2021 | Dec. 31, 2020
Disclosure Of Changes In Allowance For Doubtful Accounts [Abstract] |  |
Balance at beginning of year | € 7,881 | € 8,699
Charges – bad debt expense | 76 | 1,802
Reductions – write off of uncollectible amounts | (2,015) | (1,024)
Reversal - reversal to profit and loss | (617) |
Reclassification to assets held for sale |  | (1,596)
Balance at end of year | € 5,325 | € 7,881

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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 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 reclassification to assets held for sale. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
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- Definition Allowance for doubtful accounts reversal to profit and loss + 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
Name: | ntz_DisclosureOfChangesInAllowanceForDoubtfulAccountsAbstract
Namespace Prefix: | ntz_
Data Type: | xbrli:stringItemType
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