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Summary of Option Activity (Detail) - $ / shares	3 Months Ended
	Jun. 30, 2015	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	697,854	724,904
Incentive Stock Option Plans, Option exercised	(34,800)	(16,650)
Incentive Stock Option Plans, Option forfeited	(2,481)	(10,400)
Incentive Stock Option Plans, Ending balance	660,573	697,854
Weighted Average Price Per Share, Beginning balance	$ 9.21	$ 9.22
Weighted Average Price Per Share, Option exercised	7.50	7.50
Weighted Average Price Per Share, Option forfeited	11.49	11.49
Weighted Average Price Per Share, Ending balance	9.29	9.21
Exercisable Weighted Average Price Per Share, Beginning balance	7.71	7.82
Exercisable Weighted Average Price Per Share, Ending balance	$ 7.72	$ 7.71
Performance Based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance		107,689
Incentive Stock Option Plans, Ending balance	107,689
Weighted Average Price Per Share, Beginning balance		$ 11.49
Weighted Average Price Per Share, Ending balance	$ 11.49

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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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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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