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EMPLOYEE STOCK COMPENSATION - Share Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 4,798 $ 1,902 $ 7,691 $ 5,706
Total share-based compensation expense 1,992 790 3,195 2,371
Unrecognized Expense 14,327   $ 14,327  
Weighted-Average Remaining Expected Recognition Period     2 years 7 months 28 days  
Stock option awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 420 159 $ 667 297
Unrecognized Expense 786   $ 786  
Weighted-Average Remaining Expected Recognition Period     3 years 28 days  
Restricted stock awards and restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 4,378 1,741 $ 6,982 5,394
Unrecognized Expense 13,541   $ 13,541  
Weighted-Average Remaining Expected Recognition Period     2 years 7 months 19 days  
Stock appreciation rights        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 0 $ 2 $ 42 $ 15