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v3.25.1

Income Tax Expense - Summary of Income Tax Rates (Detail) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
IRES (state tax) [member] |  |  |
Disclosure of effective income tax rate [line items] |  |  |
Applicable tax rate | 24.00% | 24.00% | 24.00%
IRAP (regional tax) [member] |  |  |
Disclosure of effective income tax rate [line items] |  |  |
Applicable tax rate | 4.82% | 4.82% | 4.82%

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent effective income tax rate. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ntz_TaxationInformationAxis=ntz_IRESMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ntz_TaxationInformationAxis=ntz_IRAPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |