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Other Current Receivables - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018
Top of range [member]
Disclosure Of Other Current Receivables [line items]
Maturity of VAT collection	2 years

X

- Definition

Disclosure Of Other Current Receivables [line items].

+ References

No definition available.

+ Details

Name:	ntz_DisclosureOfOtherCurrentReceivablesLineItems
Namespace Prefix:	ntz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maturity of value added tax collection.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: