Summary of Stock Option (Detail) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Options
Beginning balance	1,775,400	2,242,202	2,326,627
Grants	125,750	66,850	89,600
Exercises	(300,000)	(272,325)	(110,375)
Cancellations	(45,700)	(30,750)	(37,750)
Expirations	(99,250)	(230,577)	(25,900)
Ending balance	1,456,200	1,775,400	2,242,202
Options exercisable at End of Period	1,250,673
Weighted-average exercise price
Beginning balance	$ 13.44	$ 14.28	$ 14.19
Grants	17.38	15.44	13.99
Exercises	11.34	9.01	8.84
Cancellations	16.40	15.39	15.57
Expirations	20.40	27.16	26.60
Ending balance	13.64	$ 13.44	$ 14.28
Options exercisable at End of Period	$ 13.05
Weighted-average remaining contractual life (years)
Options outstanding, Ending balance	4 years 7 months 6 days
Options exercisable, Ending balance	4 years
Aggregate intrinsic value
Options outstanding, end of period	$ 5,019,000
Options exercisable, end of period	$ 4,923,000

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

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]

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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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-Publisher FASB
-Name Accounting Standards Codification
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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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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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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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 of the plan that expired.

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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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