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Capital Stock - Details Regarding Outstanding and Exercisable Stock Options (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Number of Outstanding Options (in shares) 5,449,000      
Outstanding Options, Weighted-Average Remaining Life (Years) 5 years 8 months 12 days      
Outstanding Options, Weighted-Average Exercise Price (dollars per share) $ 9.90 $ 10.02 $ 10.77 $ 15.54
Number of Exercisable Options (in shares) 4,690,000      
Exercisable Options, Weighted-Average Remaining Life (Years) 5 years 6 months      
Exercisable Options, Weighted-Average Exercise Price (dollars per share) $ 10.86 $ 13.17 $ 18.25  
Performance Shares        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Number of shares or units granted equity based compensation awards 489,443      
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture $ 5.7      
Restricted Stock Units        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Number of shares or units granted equity based compensation awards 355,944 986,314 831,118  
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture $ 1.4 $ 3.1 $ 3.3  
Vested restricted stock (in shares) 880,320 480,498 317,283  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Deferred 481,341      
Range Of Exercise Prices [Member]        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Number of Outstanding Options (in shares) 2,527,000      
Outstanding Options, Weighted-Average Remaining Life (Years) 7 years 2 months 12 days      
Outstanding Options, Weighted-Average Exercise Price (dollars per share) $ 3.98      
Number of Exercisable Options (in shares) 1,768,000      
Exercisable Options, Weighted-Average Remaining Life (Years) 7 years 2 months 12 days      
Exercisable Options, Weighted-Average Exercise Price (dollars per share) $ 3.98      
Range of Exercise Prices, lower limit (USD per share) 0.00      
Range of Exercise Prices, upper limit (USD per share) $ 4.99      
Range Of Exercise Prices One [Member]        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Number of Outstanding Options (in shares) 1,681,000      
Outstanding Options, Weighted-Average Remaining Life (Years) 5 years 4 months 24 days      
Outstanding Options, Weighted-Average Exercise Price (dollars per share) $ 8.97      
Number of Exercisable Options (in shares) 1,681,000      
Exercisable Options, Weighted-Average Remaining Life (Years) 5 years 4 months 24 days      
Exercisable Options, Weighted-Average Exercise Price (dollars per share) $ 8.97      
Range of Exercise Prices, lower limit (USD per share) 5.00      
Range of Exercise Prices, upper limit (USD per share) $ 9.99      
Range Of Exercise Prices Two [Member]        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Number of Outstanding Options (in shares) 589,000      
Outstanding Options, Weighted-Average Remaining Life (Years) 5 years 2 months 12 days      
Outstanding Options, Weighted-Average Exercise Price (dollars per share) $ 10.18      
Number of Exercisable Options (in shares) 589,000      
Exercisable Options, Weighted-Average Remaining Life (Years) 5 years 2 months 12 days      
Exercisable Options, Weighted-Average Exercise Price (dollars per share) $ 10.18      
Range of Exercise Prices, lower limit (USD per share) 10.00      
Range of Exercise Prices, upper limit (USD per share) $ 19.99      
Range Of Exercise Prices Three [Member]        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Number of Outstanding Options (in shares) 652,000      
Outstanding Options, Weighted-Average Remaining Life (Years) 1 year 4 months 24 days      
Outstanding Options, Weighted-Average Exercise Price (dollars per share) $ 35.02      
Number of Exercisable Options (in shares) 652,000      
Exercisable Options, Weighted-Average Remaining Life (Years) 1 year 4 months 24 days      
Exercisable Options, Weighted-Average Exercise Price (dollars per share) $ 35.02      
Range of Exercise Prices, lower limit (USD per share) 20.00      
Range of Exercise Prices, upper limit (USD per share) $ 59.99