Pension and Other Employee Benefits - Summary of Allocation of Fair Value of Plan Assets of Defined Contribution Plans (Detail) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure Of Fair Value Of Plan Assets [Line Items] | ||
| Investments in listed and unlisted equity securities | 92.00% | 92.00% |
| Smart and Subsidiaries [Member] | ||
| Disclosure Of Fair Value Of Plan Assets [Line Items] | ||
| Investments in debt and fixed income securities and others | 68.00% | 71.00% |
| Investments in listed and unlisted equity securities | 32.00% | 29.00% |
| Percentage of investments in pension plan assets | 100.00% | 100.00% |