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Stock Option Activity Pursuant to Plan (Detail) (USD $)	1 Months Ended		6 Months Ended
	May 31, 2011	Apr. 30, 2011	Jun. 30, 2012
Number of Shares
Options outstanding at beginning of period			182,665
Granted
Exercised	(4,500)	(5,500)	(7,500)
Cancelled			(25,021)
Options outstanding at end of period			150,144
Weighted Average Exercise Price
Options outstanding at beginning of period			$ 19.11
Granted
Exercised			$ 13.47
Cancelled			$ 18.95
Options outstanding at end of year			$ 19.42

X

- 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

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

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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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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