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Earning Per Share - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Line Items]        
Incremental shares included in calculation of diluted EPS   17,721,954    
Shares excluded from calculation of diluted earnings per share 600,000 0 600,000 0
Restricted Stock Diluted        
Earnings Per Share [Line Items]        
Non-vested restricted stock and options   164,693    
Stock Options Diluted        
Earnings Per Share [Line Items]        
Non-vested restricted stock and options   213,969