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Stock-Based Compensation - Summary of Activity Under Stock Option Plan (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at beginning period - Options	1,273,625	1,414,900
Options granted	72,000	121,500
Options exercised	(123,925)	(262,775)
Options canceled, forfeited, or expired	(5,000)
Outstanding at ending period - Options	1,216,700	1,273,625
Exercisable at ending period - Options	601,700	566,625
Outstanding at beginning period - Wgtd. Avg. Exercise Price	$ 25.90	$ 22.46
Options granted - Wgtd. Avg. Exercise Price	56.47	48.26
Options exercised - Wgtd. Avg. Exercise Price	17.42	17.73
Options cancelled, forfeited, or expired - Wgtd. Avg. Exercise Price	48.02
Outstanding at ending period - Wgtd. Avg. Exercise Price	28.48	25.90
Exercisable at ending period - Wgtd. Avg. Exercise Price	$ 21.53	$ 20.07
Outstanding at ending period - Wgtd. Avg. Remaining Contractual Term, years	9 years 6 months 10 days	9 years 8 months 23 days
Exercisable at ending period - Wgtd. Avg. Remaining Contractual Term, years	7 years 1 month 13 days	6 years 11 months 1 day
Outstanding at ending period - Aggregate Intrinsic Value	$ 26,066	$ 32,165
Exercisable at ending period - Aggregate Intrinsic Value	$ 17,070	$ 17,611

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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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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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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 option holders acquired shares when converting their stock options into shares.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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