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Trade Receivables - Summary of Trade Receivables and Revenue (Detail) - Trade receivables [member] | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of major customers [line items] |  |
No. of customers | 2 | 3
% of trade receivables | 21.00% | 18.00%

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfMajorCustomersLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Concentration risk number of major customers. + References No definition available. + Details
Name: | ntz_ConcentrationRiskNumberOfMajorCustomers
Namespace Prefix: | ntz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Concentration risks percentage. + References No definition available. + Details
Name: | ntz_ConcentrationRisksPercentage
Namespace Prefix: | ntz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | ntz_ConcentrationRiskByBenchmark1Axis=ifrs-full_TradeReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |