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Trade Payables - Additional Information (Detail) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of trade payables [line items] |  |
Trade payables | € 68,476 | € 77,901
Trade payables due to related parties | 124 | 1,004
Currency denominated, foreign currency [member] |  |
Disclosure of trade payables [line items] |  |
Trade payables | € 26,065 | € 29,155

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- Definition The amount of current trade payables and current other payables. [Refer: Current trade payables; Other current payables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph k -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_k&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of payables due to related parties. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represents information of trade payables. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |