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Pension and Other Employee Benefits - Summary of Allocation of Fair Value of Plan Assets of Defined Benefit Pension Plans (Detail) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of fair value of plan assets [abstract] |  |
Investments in listed and unlisted equity securities | 92.00% | 79.00%
Temporary cash investments | 3.00% | 3.00%
Debt and fixed income securities | 2.00% | 16.00%
Mutual funds | 2.00% | 2.00%
Receivables and other assets | 1.00% | 0.00%
Net investments | 100.00% | 100.00%

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