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Equity - Summary of Outstanding Share Options (Detail)
 12 Months Ended
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