Pension and Other Employee Benefits - Summary of Weighted Average Assumptions Used to Determine Pension Benefits of Defined Benefit Pension Plans (Detail) |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Disclosure Of Defined Benefit Plans [Line Items] | |||
| Rate of increase in compensation | 5.70% | 5.70% | 5.70% |
| Discount rate | 6.50% | 6.20% | 6.00% |
| Investment Property [Member] | Smart and Subsidiaries [Member] | |||
| Disclosure Of Defined Benefit Plans [Line Items] | |||
| Rate of increase in compensation | 5.00% | 5.00% | 5.00% |
| Discount rate | 6.00% | 6.30% | 7.30% |