Stock-Based Compensation - Summary of Outstanding Stock Options (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares Under Options, Outstanding, Beginning balance	605,585	815,335
Number of Shares Under Options, Granted	0	0
Number of Shares Under Options, Exercised	0	0
Number of Shares Under Options, Forfeited/Cancelled	(196,835)	(209,750)
Number of Shares Under Options, Outstanding, Ending Balance	408,750	605,585	815,335
Number of Shares Under Options, Exercisable	408,750
Number of Shares Under Options, Vested or expected to vest	408,750
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 20.54	$ 23.61
Weighted Average Fair Value of incentive options, Forfeited/cancelled	18.25	32.47
Weighted Average Exercise Price, Outstanding, Ending balance	21.64	$ 20.54	$ 23.61
Weighted Average Exercise Price, Exercisable	21.64
Weighted Average Exercise Price, Vested or expected to vest	$ 21.64
Remaining Contractual Life In Years, Outstanding	2 years 1 month 6 days	2 years 9 months 18 days	3 years 3 months 18 days
Remaining Contractual Life In Years, Exercisable	2 years 1 month 6 days
Remaining Contractual Life In Years, Vested or expected to vest	2 years 1 month 6 days
Intrinsic Value, Outstanding, Beginning balance	$ 0	$ 0	$ 0
Intrinsic Value, Exercisable	0
Intrinsic Value, Vested or expected to vest	$ 0

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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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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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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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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