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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 |  |  |

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