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Changes in Significant Accounting Policies - Summary of Impact on the consolidated statement of financial position (Detail) - EUR (€) € in Thousands	Jan. 01, 2019	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Quantitative Information About Rightofuse Asset And Lease Liabilities [Line Items]
Right-of-use assets		€ 54,718	€ 55,798
Lease liabilities		€ (57,367)	€ (56,758)
IFRS 16 [member]
Disclosure Of Quantitative Information About Rightofuse Asset And Lease Liabilities [Line Items]
Right-of-use assets	56,758
Lease liabilities	(56,758)
Decrease of right-of-use assets for lease incentives	(960)
Decrease of other liabilities for lease incentives	€ 960

X

- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 53
-Subparagraph j
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Schedule disclosing quantitative information about right-of-use asset and lease liabilities.

+ References

No definition available.

+ Details

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

X

- Definition

Decrease of other liabilities for lease incentives.

+ References

No definition available.

+ Details

Name:	ntz_Increasedecreaseinotherliabilitiesforleaseincentives
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Decrease of right-of-use assets for lease incentives.

+ References

No definition available.

+ Details

Name:	ntz_Increasedecreaseinrightofuseassetsforleaseincentives
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: