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STOCKHOLDERS' EQUITY - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2017
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for grant 2,000,000.0 2,000,000.0
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period   4 years
Share granted   173,187
Fair value of shares granted | $   $ 14.9
Restricted Stock Units (RSUs) [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period   6 years
Restricted Stock Units (RSUs) [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period   3 years
Performance Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share granted   33,956
Fair value of shares granted | $   $ 3.0
Employee stock option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period   4 years
Director stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share granted 7,972 15,774
Fair value of shares granted | $ $ 0.7 $ 1.3