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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Options Issued and Significant Assumptions Used to Estimate Option Fair Values
Options issued	321	389	324
Fair value assumptions, risk free interest rate	2.70%	2.20%	1.90%
Fair value assumptions, expected life in years	6 years	6 years	6 years
Fair value assumptions, expected volatility	25.30%	22.70%	24.70%
Fair value assumptions, expected dividends	$ 0	$ 0	$ 0
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant
Weighted-average exercise price of options granted	$ 196.78	$ 170.24	$ 135.02
Weighted-average grant date fair value of options granted	$ 59.89	$ 45.73	$ 37.44

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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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-Publisher FASB
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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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Weighted average expected volatility rate of share-based compensation awards.

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- Definition

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 share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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