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Earnings Per Common Share - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share [Abstract]        
Anti-dilutive stock options excluded from the calculation of diluted EPS 224 8,710 112 4,355