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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Balance outstanding at beginning of year 7,468 4,636 2,551
Granted 5,900 5,461 3,193
Vested (1,638) (1,884) (830)
Forfeited (1,327) (745) (278)
Balance outstanding at end of year 10,403 7,468 4,636
Weighted-average grant date fair value per share - RSUs at beginning year $ 27.95 $ 45.15 $ 51.43
Granted 18.80 20.10 40.78
Vested 37.30 39.63 45.79
Forfeited 32.50 42.84 46.08
Weighted-average grant date fair value per share - RSUs at end of year $ 20.93 $ 27.95 $ 45.15