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Earnings Per Share - Narrative (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Anti-dilutive shares 10,040,453 11,653,167 10,040,453 11,653,167