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Operating Segment - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021 Segment
Disclosure Of Operating Segments [Abstract]
Number of operating segments	2
Number of reporting segments	1

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- References

No definition available.

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Namespace Prefix:	ifrs-full_
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- Definition

Number of operating business segments.

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No definition available.

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Namespace Prefix:	ntz_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

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Period Type:	duration