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Trade Receivables - Summary of Trade Receivables and Revenue (Detail) - Trade receivables [member]	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of major customers [line items]
No. of customers	2	3
% of trade receivables	21.00%	18.00%

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfMajorCustomersLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Concentration risk number of major customers.

+ References

No definition available.

+ Details

Name:	ntz_ConcentrationRiskNumberOfMajorCustomers
Namespace Prefix:	ntz_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Concentration risks percentage.

+ References

No definition available.

+ Details

Name:	ntz_ConcentrationRisksPercentage
Namespace Prefix:	ntz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ntz_ConcentrationRiskByBenchmark1Axis=ifrs-full_TradeReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: