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v3.19.1

Other Assets (Non-current and Current) - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018
Miscellaneous assets [abstract] |
Life of contractual insurance period | 5 years

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- References No definition available. + Details
Name: | ifrs-full_MiscellaneousAssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Life of contractual insurance. + References No definition available. + Details
Name: | ntz_LifeOfContractualInsurance
Namespace Prefix: | ntz_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration