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Stock-Based Compensation - Relevant Data Used to Determine the Value of Stock Options Granted During the Period (Detail) - Equity Option [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Options Issued and Significant Assumptions Used to Estimate Option Fair Values
Options issued	160	267	146
Fair value assumptions, risk free interest rate	0.80%	1.20%	2.50%
Fair value assumptions, expected life in years	6 years	6 years	5 years
Fair value assumptions, expected volatility	32.40%	27.80%	24.50%
Fair value assumptions, expected dividends	$ 0
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant
Weighted-average exercise price of options granted	$ 281.33	$ 215.12	$ 230.37
Weighted-average grant date fair value of options granted	$ 91.48	$ 63.14	$ 61.75

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- Definition

The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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