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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Balance outstanding at beginning of year 10,403 7,468 4,636
Granted 9,303 5,900 5,461
Vested (2,435) (1,638) (1,884)
Forfeited (1,294) (1,327) (745)
Balance outstanding at end of year 15,977 10,403 7,468
Weighted-average grant date fair value per share - RSUs at beginning year $ 20.93 $ 27.95 $ 45.15
Granted 15.36 18.80 20.10
Vested 30.24 37.30 39.63
Forfeited 18.74 32.50 42.84
Weighted-average grant date fair value per share - RSUs at end of year $ 16.49 $ 20.93 $ 27.95