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STOCK-BASED COMPENSATION - Schedule of Information Regarding Standard and Market Condition Based Stock Options Outstanding (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Standard stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding (in shares) 1,862,423 3,277,991 3,421,121 3,596,533
Options vested and expected to vest using estimated forfeiture rates (in shares) 1,785,740 3,175,002 3,223,919  
Options exercisable (in shares) 1,396,171 2,633,990 2,131,268  
Options outstanding, weighted average exercise price (in dollars per share) $ 9.44 $ 7.99 $ 8.44 $ 8.45
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Exercise Price (in dollars per share) 9.40 7.99 8.43  
Options exercisable, Weighted Average Exercise Price (in dollars per share) $ 9.22 $ 7.94 $ 8.22  
Options outstanding, Weighted Average Remaining Contractual Life (years) 2 years 10 months 6 days 2 years 10 months 17 days 3 years 11 months 26 days  
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Remaining Contractual Life (years) 2 years 8 months 26 days 2 years 9 months 10 days 3 years 10 months 13 days  
Options exercisable, Weighted Average Remaining Contractual Life (years) 1 year 11 months 19 days 2 years 1 month 20 days 3 years 1 month 6 days  
Options outstanding, Aggregate Intrinsic Value $ 0.8 $ 2.2 $ 9.0  
Options vested and expected to vest using estimated forfeiture rates, Aggregate Intrinsic Value 0.7 2.2 8.5  
Options exercisable, Aggregate Intrinsic Value $ 0.5 $ 2.1 $ 6.4  
Market condition based stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding (in shares) 272,081 272,081 225,000 200,000
Options vested and expected to vest using estimated forfeiture rates (in shares) 272,081 272,081 209,141  
Options exercisable (in shares) 272,081 272,081 65,625  
Options outstanding, weighted average exercise price (in dollars per share) $ 8.44 $ 8.44 $ 8.39 $ 9.05
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Exercise Price (in dollars per share) 8.44 8.44 8.38  
Options exercisable, Weighted Average Exercise Price (in dollars per share) $ 8.44 $ 8.44 $ 8.09  
Options outstanding, Weighted Average Remaining Contractual Life (years) 10 months 27 days 1 year 10 months 27 days 5 years 6 months  
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Remaining Contractual Life (years) 10 months 27 days 1 year 10 months 27 days 5 years 5 months 26 days  
Options exercisable, Weighted Average Remaining Contractual Life (years) 10 months 27 days 1 year 10 months 27 days 5 years 2 months 1 day  
Options outstanding, Aggregate Intrinsic Value $ 0.1 $ 0.0 $ 0.5  
Options vested and expected to vest using estimated forfeiture rates, Aggregate Intrinsic Value 0.1 0.0 0.5  
Options exercisable, Aggregate Intrinsic Value $ 0.1 $ 0.0 $ 0.2