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Trade Receivables - Summary of Changes in Allowance for Doubtful Accounts (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of changes in allowance for doubtful accounts [abstract] |  |
Balance at beginning of year | € 9,627 | € 10,775
Effect of the adoption of IFRS 9 (see note 5) | 0 | 37
Charges - bad debt expense | 2,389 | 745
Reductions - write off of uncollectible amounts | (3,317) | (1,930)
Balance at end of year | € 8,699 | € 9,627

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- Definition The increase (decrease) in financial assets arising from a change in measurement attribute on the entity's transition to IFRS 9. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 42L -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_42L_b&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Allowance for doubtful accounts charges. + References No definition available. + Details
Name: | ntz_AllowanceForDoubtfulAccountsCharges
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
Name: | ntz_AllowanceForDoubtfulAccountsReceivable1
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Allowance for doubtful accounts writeoff. + References No definition available. + Details
Name: | ntz_AllowanceForDoubtfulAccountsWriteoff
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
Balance Type: | na
Period Type: | duration