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Equity - Summary of Outstanding Share Options (Detail) | 12 Months Ended
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Dec. 31, 2019 shares $ / shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares
Equity [abstract] |  |  |
Beginning balance (in shares) | 19,775,000 | 19,775,000 | 22,068,000
Granted (in shares) | 1,940,210 | 1,940,210 | 1,575,000
Exercised (in shares) | (1,239,000) | (1,239,000) | (3,710,000)
Forfeited (in shares) | (110,000) | (110,000) | (107,000)
Expired (in shares) | (214,000) | (214,000) | (51,000)
Ending balance (in shares) | 20,152,000 | 20,152,000 | 19,775,000
Vested and exercisable at end of year (in shares) | 16,617,000 | 16,617,000 | 14,036,000
Outstanding at beginning of year (in dollars per share) | $ / shares |  | $ 21.75 | $ 19.52
Granted (in dollars per share) | (per share) | $ 28.62 | 28.62 | 37.44
Exercised (in dollars per share) | $ / shares |  | 8.17 | 14.58
Forfeited (in dollars per share) | $ / shares |  | 32.52 | 32.92
Expired (in dollars per share) | $ / shares |  | 38.24 | 37.56
Outstanding at ending of year (in dollars per share) | $ / shares |  | 23.02 | 21.75
Vested and exercisable at end of year (in dollars per share) | $ / shares | $ 21.32 | $ 21.32 | $ 22.83

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