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Trade Receivables - Summary of Changes in Allowance for Doubtful Accounts (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of changes in allowance for doubtful accounts [abstract]
Balance, beginning of year	€ 10,775	€ 9,544
Effect of the adoption of IFRS 9 (see note 5)	37	0
Charges - bad debt expense	745	1,475
Reductions - write off of uncollectible amounts	(1,930)	(244)
Balance, end of year	€ 9,627	€ 10,775

X

- Definition

The increase (decrease) in financial assets arising from a change in measurement attribute on the entity's transition to IFRS 9. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 42L
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_42L_b&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_IncreaseDecreaseInFinancialAssetsArisingFromChangeInMeasurementAttributeFirstApplicationOfIFRS9
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Allowance for doubtful accounts charges.

+ References

No definition available.

+ Details

Name:	ntz_AllowanceForDoubtfulAccountsCharges
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Allowance for doubtful accounts receivable1.

+ References

No definition available.

+ Details

Name:	ntz_AllowanceForDoubtfulAccountsReceivable1
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Allowance for doubtful accounts writeoff.

+ References

No definition available.

+ Details

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

X

- Definition

Disclosure of changes in allowance for doubtful accounts [abstract]

+ References

No definition available.

+ Details

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