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Employee benefits - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Italian leaving indemnities (TFR)
Employee Benefits [Line Items]
Weighted average duration of defined benefit obligation	7 years 2 months 12 days	7 years 10 months 24 days
Leaving indemnities | China
Employee Benefits [Line Items]
Weighted average duration of defined benefit obligation	8 years 6 months	9 years 8 months 12 days
Leaving indemnities | Spain
Employee Benefits [Line Items]
Weighted average duration of defined benefit obligation	7 years 4 months 24 days	10 years 2 months 12 days

X

- Definition

The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2025-01-01
-Paragraph 147
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_147_c&doctype=Standard
-URIDate 2025-03-27

+ Details

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X

- Definition

Employee benefits.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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