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Assets Held for Sale - Details of Net Cash Flows Deriving from Transaction (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2021
IMPE S.p.A. [member]
Assets Held For Sale [Line Items]
Additional interest in subsidiary	100.00%

X

- Definition

Additional proportion of ownership interest in subsidiary.

+ References

No definition available.

+ Details

Name:	ntz_AdditionalProportionOfOwnershipInterestInSubsidiary
Namespace Prefix:	ntz_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Assets held for sale.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=ntz_IMPESPAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: