Shareholders' Equity - Summary of Restricted Stock Awards (Detail) - Restricted Stock [Member] - 2007 Plan [Member] - $ / shares shares in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Summary Of Restricted Stock Unit Activity [Line Items]
Beginning balance , Nonvested shares	1,047	1,321	1,251
Granted , Nonvested shares	573	648	464
Vested , Nonvested shares	(323)	(284)	(310)
Forfeited , Nonvested shares	(264)	(638)	(84)
Ending balance , Nonvested shares	1,033	1,047	1,321
Beginning balance ,Weighted average grant date fair value	$ 6.00	$ 6.80	$ 6.30
Fair value of stock awards granted	8.19	5.64	7.50
Vested , Weighted average grant date fair value	6.31	7.60	7.24
Forfeited , Weighted average grant date fair value	5.80	5.91	6.36
Ending balance , Weighted average grant date fair value	$ 7.17	$ 6.00	$ 6.80

Schedule Of Summary Of Restricted Stock Unit Activity [Line Items]

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Subparagraph (c)(1)(iv)(3)
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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 grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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