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Option Intrinsic Values (Detail) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-Based Payment Arrangement [Abstract]
Outstanding		846,667		693,333	1,000,000	800,000
Exercisable		50,000
Exercised		0	[1]	0	0
Outstanding		$ 30.54		$ 33.23	$ 40.04	$ 35.06
Exercisable		20.77
Exercised		$ 0	[1]	$ 0	$ 0
Outstanding		$ 2.1
Exercisable		0.1
Exercised	[1]	$ 0.0
[1] The intrinsic value of the exercised options is the difference between the fair market value at time of exercise and the strike price of the option.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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