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Stock-Based Compensation Plans - Option Activity under Company's Stock Option Plans (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding, Number of Stock Options, Beginning Balance | shares	588
Granted, Number of Stock Options Outstanding | shares	141
Exercised, Number of Stock Options Outstanding | shares	(167)
Forfeited or expired, Number of Stock Options Outstanding | shares	(30)
Outstanding, Number of Stock Options, Ending Balance | shares	532
Vested or expected to vest, Number of Stock Options Outstanding | shares	514
Exercisable, Number of Stock Options Outstanding | shares	275
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 13.12
Granted, Weighted Average Exercise Price | $ / shares	23.73
Exercised, Weighted Average Exercise Price | $ / shares	10.21
Forfeited or expired, Weighted Average Exercise Price | $ / shares	15.07
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares	16.73
Vested or expected to vest, Weighted Average Exercise Price | $ / shares	16.73
Exercisable, Weighted Average Exercise Price | $ / shares	$ 13.29
Outstanding, Weighted Average Remaining Contractual Term	6 years 3 months 4 days
Vested or expected to vest, Weighted Average Remaining Contractual Term	6 years 2 months 23 days
Exercisable, Weighted Average Remaining Contractual Term	4 years 3 months 22 days
Outstanding, Aggregate Intrinsic Value | $	$ 2,368
Vested or expected to vest, Aggregate Intrinsic Value | $	2,303
Exercisable, Aggregate Intrinsic Value | $	$ 1,915

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

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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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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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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