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Retirement Benefit Plans - Summary of Life Expectancies for Employee Retiring at Age 65 (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Employee Benefits [Abstract] |  |
Retiring at the end of the reporting period, Male | 85.3 years | 85.3 years
Retiring 20 years after the end of the reporting period, Male | 86.4 years | 86.3 years
Retiring at the end of the reporting period, Female | 87.7 years | 87.7 years
Retiring 20 years after the end of the reporting period, Female | 88.7 years | 88.6 years

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- Definition Life expectation period of female employees retiring at the end of reporting period. + References No definition available. + Details
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- Definition Life expectation period of female employees retiring twenty years after the end of reporting period. + References No definition available. + Details
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- Definition Life expectation period of male employees retiring at the end of reporting period. + References No definition available. + Details
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- Definition Life expectation period of male employees retiring twenty years after the end of reporting period. + References No definition available. + Details
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- Definition Employee Benefits [Abstract] + References No definition available. + Details
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