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Earnings Per Share - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding Stock options antidilutive 369,000 376,000 369,000 376,000
Common Stock, shares issued 59,000 59,000 314,000 312,000