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Earnings Per Share - Additional Information (Detail) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Earnings Per Share [Line Items]          
Participating securities outstanding 0 0 0 0  
Stock options, outstanding 1,198,673 1,252,356 1,198,673 1,252,356 1,240,935
Stock options, weighted average exercise price $ 12.03 $ 10.47 $ 12.03 $ 10.47 $ 10.44
Common stock excluded from calculation of diluted earnings per share 253,754 163,459 348,608 170,891