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Earnings Per Share - Additional Information (Detail) - $ / shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Earnings Per Share [Line Items]      
Participating securities outstanding 0 0  
Stock options, outstanding 1,312,508 1,295,312 1,240,935
Stock options, weighted average exercise price $ 11.50 $ 9.44 $ 10.44
Common stock excluded from calculation of diluted earnings per share 520,030 199,580