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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