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Earnings Per Share - Additional Information (Detail) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jul. 31, 2017
Jul. 03, 2017
Dec. 31, 2016
Earnings Per Share [Line Items]              
Participating securities outstanding 0 0 0 0      
Stock options, outstanding 803,532   803,532       882,748
Stock options, weighted average exercise price $ 20.16   $ 20.16       $ 16.88
Common stock excluded from calculation of diluted earnings per share 187,072 359,828 222,001 417,279      
Common stock, shares issued 34,118,994   34,118,994       33,844,074
Subsequent Event              
Earnings Per Share [Line Items]              
Common stock, shares issued         3,228,069 2,807,017  
Common stock issue price per share         $ 42.75 $ 42.75  
Option To Purchase Common Stock              
Earnings Per Share [Line Items]              
Stock options, outstanding 803,532 1,315,739 803,532 1,315,739      
Stock options, weighted average exercise price $ 20.16 $ 11.70 $ 20.16 $ 11.70      
Restricted Stock Units (RSUs)              
Earnings Per Share [Line Items]              
Common stock excluded from calculation of diluted earnings per share     393,338