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Earnings (Loss) Per Share - Additional Information (Detail) (Employee Stock Option [Member])
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Employee Stock Option [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Number of common stock excluded from calculation of diluted EPS 0.5 0.8 0.5 1.0