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Earnings Per Share - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Components Of Basic And Diluted Earning Per Share [Line Items]        
Potentially dilutive stock options to purchase shares 2,385 0 4,591 0