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Earnings or Loss Per Share - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Dec. 31, 2011
Earnings Per Share Disclosure [Line Items]
Stock options, outstanding	2,625,690	2,719,100	2,625,690	2,823,400
Stock options, weighted average exercise price	$ 4.11	$ 4.09	$ 4.11	$ 4.05
Common stock excluded from calculation of diluted earnings per share	1,431,600	2,046,700	1,602,000

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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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