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Capital Stock - Schedule of Change in Treasury Shares (Detail) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Stockholders' Equity Note [Abstract]
Beginning balance	24,001,535	10,002,646
Rabbi trust shares distributed and/or sold	(470)	(1,111)
Shares repurchased	715,000	14,000,000
Ending balance	24,716,065	24,001,535

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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