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Other Assets (Non-current and Current) - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018
Miscellaneous assets [abstract]
Life of contractual insurance period	5 years

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- References

No definition available.

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Life of contractual insurance.

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No definition available.

+ Details

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