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Equity - Summary of Stock Option Activity (Detail) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Balance outstanding at beginning of year 43,121 32,789 25,233
Granted 12,401 15,467 10,895
Exercised (84) (7) (766)
Forfeited (7,040) (4,953) (1,382)
Expired (5) (175) (1,191)
Balance outstanding at end of year 48,393 43,121 32,789
Balance exercisable at end of year 24,086 19,129 14,468
Balance outstanding at beginning of year $ 44.32 $ 50.71 $ 49.69
Granted 19.12 32.08 53.21
Exercised 17.01 17.44 44.24
Forfeited 39.38 47.92 54.09
Expired 50.65 59.81 52.79
Balance outstanding at end of year 38.62 44.32 50.71
Balance exercisable at end of year $ 46.89 $ 47.94 $ 46.06