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Assets Held for Sale - Details of Net Cash Flows Deriving from Transaction (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2021
IMPE S.p.A. [member] |
Assets Held For Sale [Line Items] |
Additional interest in subsidiary | 100.00%

X
- Definition Additional proportion of ownership interest in subsidiary. + References No definition available. + Details
Name: | ntz_AdditionalProportionOfOwnershipInterestInSubsidiary
Namespace Prefix: | ntz_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Assets held for sale. + References No definition available. + Details
Name: | ntz_AssetsHeldForSaleLineItems
Namespace Prefix: | ntz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=ntz_IMPESPAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |