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v3.19.1

Employees' Leaving Entitlement - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Changes in net defined benefit liability (asset) [abstract] |  |
Average duration of defined benefit plans | 10 years 7 months 17 days | 11 years 2 months 8 days

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

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- Definition Average duration of defined benefit plans. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration