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Earnings Per Share - Additional Information (Detail)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Antidilutive shares excluded from the diluted earnings per share calculations 36,203 37,500 36,203 37,500