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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, 2020 | Dec. 31, 2019
Disclosure Of Fair Value Of Plan Assets [Abstract] |  |
Investments in listed and unlisted equity securities | 86.00% | 96.00%
Temporary cash investments | 12.00% | 3.00%
Debt and fixed income securities | 2.00% | 1.00%
Net investments | 100.00% | 100.00%

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