Summary of Stock Option Activity and Related Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2012
Number of Shares (Options)
Outstanding as of December 31, 2011	813,767
Granted
Forfeited
Exercised	(328,973)
Outstanding as of December 31, 2012	484,794
Weighted Average Exercise Price
Outstanding as of December 31, 2011	$ 12.89
Granted
Forfeited
Exercised	$ 12.33
Outstanding as of December 31, 2012	$ 13.26

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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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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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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

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