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Earnings per Share - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Number of anti-dilutive instruments excluded from computation of weighted-average shares for diluted earnings per share 0 3,115 0 3,115