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Subsequents Events - Additional Information (Detail)	Feb. 21, 2019	Feb. 20, 2019
Major ordinary share transactions [member]
Disclosure of non-adjusting events after reporting period [line items]
Ratio of American Depositary Shares to ordinary shares	500.00%	100.00%

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- 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

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- Definition

Ratio of American Depositary Shares to ordinary shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: