Pension and Other Employee Benefits - Summary of Allocation of Fair Value of Plan Assets of Defined Benefit Pension Plans (Detail) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of fair value of plan assets [abstract] | ||
| Investments in listed and unlisted equity securities | 92.00% | 92.00% |
| Temporary cash investments | 3.00% | 3.00% |
| Debt and fixed income securities | 2.00% | 2.00% |
| Mutual funds | 2.00% | 2.00% |
| Receivables and other assets | 1.00% | 1.00% |
| Net investments | 100.00% | 100.00% |