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Stock-Based Compensation - Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding, Beginning balance	1,097,331	1,016,012	943,103
Options, Granted	181,472	172,697	340,609
Options, Exercised	(344,334)	(65,502)	(221,630)
Options, Forfeited	(61,235)	(25,876)	(46,070)
Options Outstanding, Ending balance	873,234	1,097,331	1,016,012
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 47.60	$ 44.72	$ 37.91
Weighted Average Exercise Price, Granted	59.88	55.87	48.58
Weighted Average Exercise Price, Exercised	41.66	21.53	19.42
Weighted Average Exercise Price, Forfeited	56.67	55.93	55.58
Weighted Average Exercise Price, Outstanding, Ending Balance	$ 51.86	$ 47.60	$ 44.72

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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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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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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