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Derivative Financial Instruments - Additional information (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Change in value of forward elements of forward contracts [abstract] |  |
Net unrealized expense (gain) | € 102 | € (72)

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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 Adjustments for unrealised foreign exchange losses (gains) Debt Securities + References No definition available. + Details
Name: | ntz_AdjustmentsForUnrealisedForeignExchangeLossesGainsDebtSecurities
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration