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Employees' Leaving Entitlement - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Changes in net defined benefit liability (asset) [abstract]
Average duration of defined benefit plans	10 years	10 years 7 months 17 days

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- References

No definition available.

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- Definition

Average duration of defined benefit plans.

+ References

No definition available.

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Namespace Prefix:	ntz_
Data Type:	xbrli:durationItemType
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