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Summary of Option Activity (Detail) (USD $)	3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Exercised, Exercise price	$ 7.5	$ 7.5
Incentive Stock Option Plans, Beginning balance	692,012	705,345
Incentive Stock Option Plans, Options granted
Incentive Stock Option Plans, Option exercised	(13,333)	(6,666)
Incentive Stock Option Plans, Options expired or forfeited		(6,667)
Incentive Stock Option Plans, Ending balance	678,679	692,012
Weighted Average Price Per Share, Beginning balance	$ 7.71	$ 7.70
Weighted Average Price Per Share, Option granted
Weighted Average Price Per Share, Option exercised	$ 7.50	$ 7.50
Weighted Average Price Per Share, Options forfeited		$ 7.50
Weighted Average Price Per Share, Ending balance	$ 7.71	$ 7.71
Exercisable Weighted Average Price Per Share, Beginning balance	$ 7.96	$ 7.95
Exercisable Weighted Average Price Per Share, Ending balance	$ 8.07	$ 7.96

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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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 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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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.

+ References

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Number of share options (or share units) exercised during the current period.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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