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Revenue - Summary of Information About Receivables, Contract Assets And Contract Liabilities From Contracts With Customers (Detail) - EUR (€) € in Thousands	Dec. 31, 2020	Dec. 31, 2019
Receivables From Contracts With Customers [Abstract]
Trade receivables	€ 33,934	€ 29,187
Trade receivables included in “assets held for sale”	1,304
Contract liabilities	€ 24,183	€ 23,103

X

- Definition

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
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-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of current trade receivables. [Refer: Trade receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
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-IssueDate 2020-01-01
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+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Trade receivables included in 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:	instant