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Share-Based Compensation - Certain Information Related to Stock Options and PSUs (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Options:      
Options outstanding, beginning of period (in shares) 2,025,000    
Options, granted (in shares) 1,214,000    
Options, forfeited (in shares) (5,000)    
Options exercised (in shares) 0    
Options, expired (in shares) (132,000)    
Options outstanding, end of period (in shares) 3,102,000 2,025,000  
Options, exercisable, end of period (in shares) 1,653,000    
Weighted Average Exercise Price per Share:      
Options outstanding, beginning of period, weighted average exercise price per share (in dollars per share) $ 27.28    
Options granted, weighted average exercise price per share (in dollars per share) 17.77    
Options forfeited, weighted average exercise price per share (in dollars per share) 31.64    
Options exercised, weighted average exercise price per share (in dollars per share) 0    
Options expired, weighted average exercise price per share (in dollars per share) 22.84    
Options outstanding, end of period, weighted average exercise price per share (in dollars per share) 23.74 $ 27.28  
Options exercisable, end of period, weighted average exercise price per share (in dollars per share) $ 26.00    
Options outstanding, aggregate intrinsic value $ 32    
Options exercisable, aggregate intrinsic value $ 0    
Options outstanding, weighted average remaining term 7 years 2 months 19 days    
Options exercisable, weighted average remaining term 5 years 8 months 1 day    
Restricted Stock [Member]      
Number of Shares:      
Outstanding, beginning balance (in shares) 16,000    
Granted (in shares) 0    
Forfeited (in shares) 0    
Vested (in shares) (16,000)    
Outstanding, ending balance (in shares) 0 16,000  
Weighted Average Grant Date Fair Value per Share:      
Outstanding, beginning of period, weighted average grant date fair value per share (in dollars per share) $ 30.85    
Granted, weighted average grant date fair value (in dollars per share) 0 $ 30.73 $ 33.64
Forfeited, weighted average grant date fair value (in dollars per share) 0    
Vested, weighted average grant date fair value (in dollars per share) 30.85    
Outstanding, end of period, weighted average grant date fair value per share (in dollars per share) $ 0 $ 30.85  
Performance Share Units [Member]      
Number of Shares:      
Outstanding, beginning balance (in shares) 149,000    
Granted (in shares) 0    
Forfeited (in shares) 0    
Vested (in shares) (83,000)    
Outstanding, ending balance (in shares) 66,000 149,000  
Weighted Average Grant Date Fair Value per Share:      
Outstanding, beginning of period, weighted average grant date fair value per share (in dollars per share) $ 32.13    
Granted, weighted average grant date fair value (in dollars per share) 0 $ 33.47 32.51
Forfeited, weighted average grant date fair value (in dollars per share) 0    
Vested, weighted average grant date fair value (in dollars per share) 31.76    
Outstanding, end of period, weighted average grant date fair value per share (in dollars per share) $ 32.59 $ 32.13  
Restricted Stock Units (RSUs) [Member]      
Number of Shares:      
Outstanding, beginning balance (in shares) 25,000    
Granted (in shares) 342,000    
Forfeited (in shares) 0    
Vested (in shares) (90,000)    
Outstanding, ending balance (in shares) 277,000 25,000  
Weighted Average Grant Date Fair Value per Share:      
Outstanding, beginning of period, weighted average grant date fair value per share (in dollars per share) $ 26.47    
Granted, weighted average grant date fair value (in dollars per share) 16.13 $ 26.47 $ 0
Forfeited, weighted average grant date fair value (in dollars per share) 0    
Vested, weighted average grant date fair value (in dollars per share) 19.49    
Outstanding, end of period, weighted average grant date fair value per share (in dollars per share) $ 15.97 $ 26.47