Stock-Based Compensation Plans and Employee Benefits - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options Outstanding, Beginning Balance	350	446	588
Number of Options, Granted	0	0	0
Number of Options, Spin-off adjustment			139
Number of Options, Exercised	0	(12)	(19)
Number of Options, Forfeited	(27)	(84)	(262)
Number of Options Outstanding, Ending Balance	323	350	446
Number of Options exercisable	323	333	368
Weighted Average Exercise Price, Beginning balance	$ 26.42	$ 25.71	$ 27.64
Weighted Average Exercise Price, Granted	0	0	0
Weighted Average Exercise Price, Spin-off adjustment			0
Weighted Average Exercise Price, Exercised	0	9.73	9.73
Weighted Average Exercise Price, Forfeited	22.20	25.04	32.26
Weighted Average Exercise Price, Ending balance	26.77	26.42	25.71
Weighted Average Exercise Price, Options exercisable	$ 26.77	$ 26.58	$ 25.86
Weighted-Average Remaining Contractual Term (Years), Ending Balance	4 years
Weighted-Average Remaining Contractual Term (Years), Options exercisable	4 years	4 years 8 months 12 days	4 years 9 months 18 days
Aggregate Intrinsic Value, Options, Ending balance	$ 0
Aggregate Intrinsic Value, Options exercisable	$ 0	$ 0	$ 27

Share based compensation arrangement by share based payment award options adjustments due to spin off.

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Share based compensation arrangement by share based payment award options spin off adjustments weighted average grand date fair value.

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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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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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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 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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Number of share options (or share units) exercised during the current period.

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