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Earnings Per Share - Additional Information (Detail) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Anti-dilutive excluded from calculation of diluted earnings per share 243 624 836 1,197