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Earnings Per Share - Additional Information (Detail) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Earnings Per Share [Line Items]          
Participating securities outstanding 0 0      
Stock options, outstanding 1,315,739 1,265,486 1,315,739 1,265,486 1,240,935
Stock options, weighted average exercise price $ 11.70 $ 9.68 $ 11.70 $ 9.68 $ 10.44
Common stock excluded from calculation of diluted earnings per share 359,828 126,541 417,279 150,041