Summary of Stock Option Transactions Relating to Non-Qualified Stock Option Plans (Detail) - Stock options $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) $ / shares shares
Number of Shares
No. of options, Outstanding at December 31, 2018 \| shares	706
No. of options, Granted \| shares	0
No. of options, Exercised \| shares	(62)
No. of options, Cancelled \| shares	0
No. of options, Outstanding at December 31, 2019 \| shares	644
No. of options, Exercisable at December 31, 2019 \| shares	644
Weighted-Average Exercise Price per Share
Weighted-Average Exercise Price of options, Outstanding at December 31, 2018 \| $ / shares	$ 20.32
Weighted-Average Exercise Price of options, Granted \| $ / shares	0
Weighted-Average Exercise Price of options, Exercised \| $ / shares	14.19
Weighted-Average Exercise Price of options, Cancelled \| $ / shares	0
Weighted-Average Exercise Price of options, Outstanding at December 31, 2019 \| $ / shares	20.91
Weighted-Average Exercise Price of options, Exercisable at December 31, 2019 \| $ / shares	$ 20.91
Weighted Average Remaining Contractual Term (in years)
Outstanding at December 31, 2019	1 year 4 months 24 days
Exercisable at December 31, 2019	1 year 4 months 24 days
Aggregate Intrinsic Value
Outstanding at December 31, 2019 \| $	$ 0
Exercisable at December 31, 2019 \| $	$ 0

Share-based compensation arrangement by share-based payment award, options, aggregate intrinsic value.

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Share-based compensation arrangement by share-based payment award, options, weighted average exercise price.

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]

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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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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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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 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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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. 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 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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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 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 exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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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