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Equity - Schedule of Number of RSUs Issued and Outstanding (Detail) - Restricted Stock Units [Member] - $ / 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 beginning of year 15,977 10,403 7,468
Granted 10,848 9,303 5,900
Vested (4,324) (2,435) (1,638)
Forfeited (1,781) (1,294) (1,327)
Balance outstanding at end of year 20,720 15,977 10,403
Weighted-average grant date fair value per share - RSUs at beginning year $ 16.49 $ 20.93 $ 27.95
Granted 11.42 15.36 18.80
Vested 19.49 30.24 37.30
Forfeited 18.18 18.74 32.50
Weighted-average grant date fair value per share - RSUs at end of year $ 13.81 $ 16.49 $ 20.93