Summary of Stock Option Activities (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Number of Options
Outstanding at December 31, 2011	940,000
Granted
Exercised
Forfeited	(47,000)
Outstanding at December 31, 2012	893,000	940,000
Exercisable at December 31, 2012
Weighted Average Exercise Price
Outstanding at December 31, 2011	$ 9.75
Granted
Exercised
Forfeited	$ 9.75
Outstanding at December 31, 2012	$ 9.75	$ 9.75
Exercisable at December 31, 2012
Weighted Average Remaining Contractual Terms (years)
Options Outstanding, Weighted Average Remaining Contractual Terms	8 years	8 years
Aggregate Intrinsic Value
Outstanding at December 31, 2010
Outstanding at December 31, 2011
Exercisable at December 31, 2011

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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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 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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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 can acquire the shares reserved for issuance on stock options awarded.

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

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