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Unamortized Stock-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 6,561	$ 7,160	$ 5,805
Unamortized Stock-Based Compensation	10,489	8,552	7,731
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	3,166	3,655	3,272
Unamortized Stock-Based Compensation	$ 6,954	$ 5,512	$ 5,006
Remaining Weighted Average Period (years)	2 years	1 year 10 months 24 days	1 year 3 months 18 days
Unrestricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 461	$ 411	$ 385
Unamortized Stock-Based Compensation	$ 183	$ 205	$ 160
Remaining Weighted Average Period (years)	4 months 24 days	4 months 24 days	4 months 24 days
Performance Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 2,934	$ 3,094	$ 2,148
Unamortized Stock-Based Compensation	$ 3,352	$ 2,835	$ 2,565
Remaining Weighted Average Period (years)	2 years	1 year 10 months 24 days	1 year 10 months 24 days

X

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of noncash expense for share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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