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Shared-based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards vested and charged	$ 602,000	$ 782,000	$ 1,700,000	$ 2,400,000
Total income tax benefit recognized related to restricted stock awards	212,000	276,000	602,000	849,000
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized	4,400,000		$ 4,400,000
Compensation cost recognition weighted average period			2 years 6 months
Share based compensation expense	156,000	82,000	$ 634,000	454,000
Award vesting period			5 years
Total Tax Benefit Recognized In Additional Paid-in Capital Upon Vesting Of Restricted Stock Awards	5,000	$ 12,000	$ 170,000	$ 51,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized	$ 700,000		$ 700,000
Compensation cost recognition weighted average period			2 years 1 month 6 days
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value			$ 15.24
Share based compensation arrangement by share based payment award options expiration term			10 years
Share based compensation arrangement by share based payment award options vesting period			3 years
Stock Options [Member] | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, shares authorized under stock option plans, exercise price range, upper range limit			$ 31.55
Stock Options [Member] | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, shares authorized under stock option plans, exercise price range, lower range limit			$ 24.26

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Expiration term for options outstanding during the reporting period.

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Share based compensation arrangement by share-based payment award options vesting period during the reporting period.

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Total tax benefit recognized in additional paid-in capital upon vesting of restricted stock awards.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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