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Summary of Stock Options Summarized by Exercise Price (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Weighted Average, Exercise Price	$ 9.25	$ 9.29	$ 9.21	$ 9.22
Exercisable Weighted Average, Exercise Price	$ 7.73	$ 7.72	$ 7.71	7.82
Performance Based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Weighted Average, Shares	98,410
Outstanding Weighted Average, Remaining Life (Months)	27 months
Outstanding Weighted Average, Exercise Price	$ 11.49			$ 11.49
Performance Based Options | Range Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Per Share, Lower Range	$ 11.49
Outstanding Weighted Average, Shares	98,410
Outstanding Weighted Average, Remaining Life (Months)	27 months
Outstanding Weighted Average, Exercise Price	$ 11.49
Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Weighted Average, Shares	633,991
Outstanding Weighted Average, Remaining Life (Months)	82 months
Outstanding Weighted Average, Exercise Price	$ 9.25
Exercisable Weighted Average, Shares	378,429
Exercisable Weighted Average, Exercise Price	$ 7.73
Incentive Stock Option Plan | Range One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Per Share, Lower Range	$ 7.50
Outstanding Weighted Average, Shares	361,750
Outstanding Weighted Average, Remaining Life (Months)	62 months
Outstanding Weighted Average, Exercise Price	$ 7.50
Exercisable Weighted Average, Shares	361,750
Exercisable Weighted Average, Exercise Price	$ 7.50
Incentive Stock Option Plan | Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Per Share, Lower Range	$ 11.32
Outstanding Weighted Average, Shares	272,241
Exercise Price Per Share, Upper Range	$ 11.49
Outstanding Weighted Average, Remaining Life (Months)	107 months
Outstanding Weighted Average, Exercise Price	$ 11.56
Exercisable Weighted Average, Shares	16,679
Exercisable Weighted Average, Exercise Price	$ 12.69

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

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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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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