Stock-based Compensation and Other Employee Benefits - Schedule of Stock Options Outstanding and Exercisable (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shares
Beginning balance (in shares)	150	315	442
Options forfeited and expired (in shares)			(12)
Options exercised (in shares)	(75)	(165)	(115)
Ending balance (in shares)	75	150	315
Options vested and expected to vest, ending balance (in shares)	75
Options exercisable, ending balance (in shares)	75
Weighted average exercise price
Beginning balance (in usd per share)	$ 15.43	$ 13.86	$ 13.20
Options forfeited and expired (in usd per share)			10.77
Options exercised (in usd per share)	14.28	12.45	11.64
Ending balance (in usd per share)	16.57	$ 15.43	$ 13.86
Options vested and expected to vest, ending balance (in usd per share)	16.57
Options exercisable, ending balance (in usd per share)	$ 16.57
Weighted average remaining contractual term (years)
Options outstanding	8 months 5 days	1 year 3 months 7 days	1 year 5 months 16 days
Options vested and expected to vest	8 months 5 days
Options exercisable	8 months 5 days
Aggregate intrinsic value
Options outstanding	$ 617	$ 2,116	$ 9,480
Options vested and expected to vest	617
Options exercisable	$ 617

Share-based Compensation Arrangement by Share-based Payment Award, Intrinsic Value [Abstract]

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Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]

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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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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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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 price at which option holders acquired shares when converting their stock options into shares.

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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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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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