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Equity - Summary of Information Relating to Share Options Outstanding (Detail) shares in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares | Dec. 31, 2017 shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding Share Options (in shares) | shares | 20,152 | 19,775 | 22,068
Weighted Average Remaining Life of Outstanding Options (months) | 64 years |  |
Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
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 |  |
$ 5.34 — $ 15.35 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding Share Options (in shares) | shares | 5,400 |  |
Weighted Average Remaining Life of Outstanding Options (months) | 70 years |  |
$ 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 |  |
$ 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 |  |
$ 15.36 — $ 24.97 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding Share Options (in shares) | shares | 3,471 |  |
Weighted Average Remaining Life of Outstanding Options (months) | 60 years |  |
$ 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 |  |
$ 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 |  |
$ 24.98 — $ 26.79 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding Share Options (in shares) | shares | 2,155 |  |
Weighted Average Remaining Life of Outstanding Options (months) | 47 years |  |
$ 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 |  |
$ 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 |  |
$ 26.80 — $ 36.85 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding Share Options (in shares) | shares | 6,123 |  |
Weighted Average Remaining Life of Outstanding Options (months) | 70 years |  |
$ 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 |  |
$ 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 |  |
$ 36.86 — $ 58.80 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding Share Options (in shares) | shares | 3,003 |  |
Weighted Average Remaining Life of Outstanding Options (months) | 58 years |  |
$ 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 |  |
$ 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 |  |

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