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SHARE-BASED COMPENSATION - Performance Awards (Detail) - Performance Shares - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted  Average Fair Value      
Granted (in USD per share)   $ 16.66 $ 15.25
Market Conditions      
No. of Stock Units      
Beginning of year (in shares) [1] 489    
Granted (in shares) [1] 162    
Vested and settled (in shares) [1] (89)    
Cancelled (in shares) [1] (8)    
End of year (in shares) [1] 554 489  
Weighted  Average Fair Value      
Beginning of year (in USD per share) $ 16.49    
Granted (in USD per share) 7.99    
Vested and settled (in USD per share) 17.54    
Cancelled (in USD per share) 25.24    
Stock and stock units, end of year (in USD per share) $ 13.69 $ 16.49  
Other than Market Conditions      
No. of Stock Units      
Beginning of year (in shares) [1] 209    
Granted (in shares) [1] 162    
Vested and settled (in shares) [1] (65)    
Cancelled (in shares) [1] (32)    
End of year (in shares) [1] 274 209  
Weighted  Average Fair Value      
Beginning of year (in USD per share) $ 17.06    
Granted (in USD per share) 8.56    
Vested and settled (in USD per share) 15.24    
Cancelled (in USD per share) 16.05    
Stock and stock units, end of year (in USD per share) $ 12.55 $ 17.06  
[1] Performance units with variable payouts are shown at target level of performance.