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Equity - Summary of Stock Option Activity (Detail) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Balance outstanding at begining of year 40,064 48,393 43,121
Granted     12,401
Exercised   (11) (84)
Forfeited (3,610) (8,318) (7,040)
Expired (1,220)   (5)
Balance outstanding at end of year 35,234 40,064 48,393
Balance exercisable at end of year 28,556 26,601 24,086
Balance outstanding at begining of year $ 37.90 $ 38.62 $ 44.32
Granted     19.12
Exercised   16.99 17.01
Forfeited 40.24 42.12 39.38
Expired 49.35   50.65
Balance outstanding at end of year 37.27 37.90 38.62
Balance exercisable at end of year $ 40.56 $ 43.41 $ 46.89