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Income taxes - Effective income tax rate (Detail)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income taxes [Abstract]      
Weighted average statutory income tax rate 22.00% 23.60% 22.70%
Recognition of previously unrecognized tax loss and credit carryforwards rate 16.80% 0.10% (26.90%)
Unrecognized tax loss and credit carryforwards rate (9.60%) (0.70%) 1.90%
Changes to Recognition of Temporary Differences Rate (26.20%) (0.20%) 0.30%
Tax rate effect of revenues exempt from taxation 22.80% 5.80% (40.60%)
Tax rate effect of expense not deductible in determining taxable profit (tax loss) (10.70%) (22.90%) 19.30%
Withholding and other taxes (5.10%) (1.40%) 7.20%
Tax rate effect from change in tax rate 0.90% (1.00%) (1.90%)
Tax rate effect of adjustments for current tax of prior periods 1.90% 0.70% (2.40%)
Tax expenses (benefit) due to other tax liabilities 2.30% 2.80% 4.40%
Other tax rate effects for reconciliation between accounting profit and tax expense (income) 1.90% (0.20%) (4.00%)
Average effective tax rate 17.00% 6.50% (20.00%)