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Stock-Based Compensation Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012 Stock Options	Dec. 31, 2012 Stock Options Maximum	Dec. 31, 2009 2009 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	209,192		223,000
Aggregate fair value of stock for which any optionee may be granted incentive options which are first exercisable during any calendar year		$ 100,000
Options granted vesting period	5 years
Options granted expiration period	10 years		10 years

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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