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Retirement Benefit Plans - Summary of Life Expectancies for Employee Retiring at Age 65 (Detail)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Employee Benefits [Abstract]    
Retiring at the end of the reporting period, Male 85 years 4 months 24 days 85 years 3 months 18 days
Retiring 20 years after the end of the reporting period, Male 86 years 4 months 24 days 86 years 3 months 18 days
Retiring at the end of the reporting period, Female 87 years 8 months 12 days 87 years 8 months 12 days
Retiring 20 years after the end of the reporting period, Female 88 years 8 months 12 days 88 years 7 months 6 days