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Equity - Summary of Outstanding Share Options (Detail) | 12 Months Ended
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Dec. 31, 2020 shares $ / shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares
Equity [abstract] |  |  |
Beginning balance (in shares) | 20,152,000 | 20,152,000 | 19,775,000
Granted (in shares) | 6,313,710 | 6,313,710 | 1,940,000
Exercised (in shares) | (156,000) | (156,000) | (1,239,000)
Forfeited (in shares) | (293,000) | (293,000) | (110,000)
Expired (in shares) | (767,000) | (767,000) | (214,000)
Ending balance (in shares) | 25,250,000 | 25,250,000 | 20,152,000
Vested and exercisable at end of year (in shares) | 17,368,000 | 17,368,000 | 16,617,000
Outstanding at beginning of year (in dollars per share) | $ / shares |  | $ 23.02 | $ 21.75
Granted (in dollars per share) | (per share) | $ 14.42 | 14.42 | 28.62
Exercised (in dollars per share) | $ / shares |  | 8.33 | 8.17
Forfeited (in dollars per share) | $ / shares |  | 20.97 | 32.52
Expired (in dollars per share) | $ / shares |  | 35.14 | 38.24
Outstanding at ending of year (in dollars per share) | $ / shares |  | 20.61 | 23.02
Vested and exercisable at end of year (in dollars per share) | $ / shares | $ 21.76 | $ 21.76 | $ 21.32

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