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EMPLOYEE STOCK COMPENSATION - Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Number of Shares        
Outstanding at beginning of period (in shares) 740,805   968,591  
Exercised (in shares) (257,495)   (389,281)  
Forfeited (in shares) (77,337)   (173,337)  
Outstanding at end of period (in shares) 405,973 740,805 405,973 968,591
Exercisable at end of period (in shares) 204,541   204,541  
Weighted-Average Exercise Price Per Share        
Outstanding at beginning of period (in dollars per share) $ 13.80   $ 13.95  
Exercised (in dollars per share) 12.72   12.54  
Forfeited (in dollars per share) 13.97   15.92  
Outstanding at end of period (in dollars per share) 14.46 $ 13.80 14.46 $ 13.95
Exercisable at end of period (in dollars per share) $ 13.62   $ 13.62  
Weighted-Average Remaining Contract Term        
Outstanding 7 years 1 month 10 days 7 years 22 days 7 years 1 month 12 days 6 years 4 months 10 days
Exercised 6 years 3 months 29 days   6 years 21 days  
Forfeited 7 years 3 months 7 days   8 years 1 month 13 days  
Exercisable at end of period 6 years 2 months 30 days   6 years 2 months 30 days  
Aggregated Intrinsic Value (In thousands)        
Outstanding $ 2,555 $ 5,702 $ 2,555 $ 3,336
Exercisable at end of period $ 1,458   $ 1,458