Stockholders' Equity - Schedule of Stock Option Activity (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding at December 31, 2018	583,000
Number of Shares, Granted	0
Number of Shares, Exercised	(125,000)
Number of Shares, Forfeited	(22,000)
Number of Shares, Outstanding at December 31, 2019	436,000
Number of Shares, Exercisable at December 31, 2019	422,000
Number of Shares, Vested and expected to vest at December 31, 2019	436,000
Weighted - Average Exercise Price Per Share, Outstanding, Beginning balance \| $ / shares	$ 35.27
Weighted - Average Exercise Price Per Share, Exercised \| $ / shares	34.03
Weighted - Average Exercise Price Per Share, Forfeited \| $ / shares	35.38
Weighted - Average Exercise Price Per Share, Outstanding, Ending balance \| $ / shares	35.62
Weighted - Average Exercise Price Per Share, Exercisable at December 31, 2019 \| $ / shares	35.62
Weighted - Average Exercise Price Per Share, Vested and expected to vest at December 31, 2019 \| $ / shares	$ 35.62
Weighted - Average Remaining Contractual Term, Outstanding at December 31, 2019	3 years 9 months
Weighted - Average Remaining Contractual Term, Exercisable at December 31, 2019	3 years 8 months 1 day
Weighted - Average Remaining Contractual Term, Vested and expected to vest at December 31, 2019	3 years 9 months
Aggregate Intrinsic Value, Outstanding at December 31, 2019 \| $	$ 2,650
Aggregate Intrinsic Value, Exercisable at December 31, 2019 \| $	2,566
Aggregate Intrinsic Value, Vested and expected to vest at December 31, 2019 \| $	$ 2,650

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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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Gross 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 grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest exercisable options that may 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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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 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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Number of share options (or share units) exercised during the current period.

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