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Operating Segment - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 Segment
Disclosure of operating segments [abstract] |
Number of operating segments | 2
Number of reporting segments | 1

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

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- Definition Number of operating segments. + References No definition available. + Details
Name: | ntz_NumberOfOperatingSegments
Namespace Prefix: | ntz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of reporting segments. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration