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Earnings Per Share - Narrative (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Anti-dilutive shares 12,098,923 8,654,028 12,098,923 8,654,028