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Equity - Summary of Information Relating to Share Options Outstanding (Detail) shares in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares | Dec. 31, 2018 shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding Share Options (in shares) | shares | 25,250 | 20,152 | 19,775
Weighted Average Remaining Life of Outstanding Options (months) | 68 months |  |
Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price Range (in dollars per share) | $ 5.34 |  |
Exercise Price Range (in dollars per share) | 5.34 |  |
Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price Range (in dollars per share) | 58.80 |  |
Exercise Price Range (in dollars per share) | $ 58.80 |  |
$ 5.34 — $ 15.35 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding Share Options (in shares) | shares | 10,699 |  |
Weighted Average Remaining Life of Outstanding Options (months) | 84 months |  |
$ 5.34 — $ 15.35 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price Range (in dollars per share) | $ 5.34 |  |
Exercise Price Range (in dollars per share) | 5.34 |  |
$ 5.34 — $ 15.35 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price Range (in dollars per share) | 15.35 |  |
Exercise Price Range (in dollars per share) | $ 15.35 |  |
$ 15.36 — $ 24.97 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding Share Options (in shares) | shares | 4,135 |  |
Weighted Average Remaining Life of Outstanding Options (months) | 60 months |  |
$ 15.36 — $ 24.97 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price Range (in dollars per share) | $ 15.36 |  |
Exercise Price Range (in dollars per share) | 15.36 |  |
$ 15.36 — $ 24.97 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price Range (in dollars per share) | 24.97 |  |
Exercise Price Range (in dollars per share) | $ 24.97 |  |
$ 24.98 — $ 26.79 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding Share Options (in shares) | shares | 2,127 |  |
Weighted Average Remaining Life of Outstanding Options (months) | 36 months |  |
$ 24.98 — $ 26.79 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price Range (in dollars per share) | $ 24.98 |  |
Exercise Price Range (in dollars per share) | 24.98 |  |
$ 24.98 — $ 26.79 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price Range (in dollars per share) | 26.79 |  |
Exercise Price Range (in dollars per share) | $ 26.79 |  |
$ 26.80 — $ 36.85 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding Share Options (in shares) | shares | 5,339 |  |
Weighted Average Remaining Life of Outstanding Options (months) | 67 months |  |
$ 26.80 — $ 36.85 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price Range (in dollars per share) | $ 26.80 |  |
Exercise Price Range (in dollars per share) | 26.80 |  |
$ 26.80 — $ 36.85 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price Range (in dollars per share) | 36.85 |  |
Exercise Price Range (in dollars per share) | $ 36.85 |  |
$ 36.86 — $ 58.80 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding Share Options (in shares) | shares | 2,950 |  |
Weighted Average Remaining Life of Outstanding Options (months) | 46 months |  |
$ 36.86 — $ 58.80 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price Range (in dollars per share) | $ 36.86 |  |
Exercise Price Range (in dollars per share) | 36.86 |  |
$ 36.86 — $ 58.80 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price Range (in dollars per share) | 58.80 |  |
Exercise Price Range (in dollars per share) | $ 58.80 |  |

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