Shareholders' equity - Schedule of movement between the opening and closing number of shares issued per class of share (Detail) - shares |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of Shares per Class [Line Items] | ||
| Beginning balance | 557,186,400 | 557,186,400 |
| Ending balance | 557,186,400 | 557,186,400 |
| Class A shares [member] | ||
| Disclosure of Shares per Class [Line Items] | ||
| Beginning balance | 371,457,600 | 371,457,600 |
| Ending balance | 371,457,600 | 371,457,600 |
| Class B shares [member] | ||
| Disclosure of Shares per Class [Line Items] | ||
| Beginning balance | 185,728,800 | 185,728,800 |
| Ending balance | 185,728,800 | 185,728,800 |