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Deferred Income for Government Grants - Summary of Changes in the Carrying Amount of Deferred Income for Government Grants (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Accruals And Deferred Income 1 [Abstract] |  |
Deferred income beginning balance | € 12,458 | € 13,869
Additions | 1,725 |
Reclassification to liabilities directly related to assets held for sale |  | (11)
Credit to profit or loss | (1,429) | (1,400)
Deferred income ending balance | € 12,754 | € 12,458

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- Definition The amount of non-current government grants recognised on the statement of financial position as deferred income. [Refer: Government [member]; Government grants] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Period Type: | duration

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- Definition Deferred income additions. + References No definition available. + Details
Name: | ntz_DeferredIncomeAdditions
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase decrease in deferred income. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Reclassification to liabilities directly related to assets held for sale. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration