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Stock-Based Compensation - Summary of Performance Units Activity (Detail) - Performance Units
 3 Months Ended
Mar. 31, 2020
$ / shares
shares
Number of Performance Units  
Outstanding number of shares (Units), beginning balance 6,058,464
Granted, number of shares (Units) 339,677
Vested, number of shares (Units) (1,496,377) [1]
Forfeited, number of shares (Units) (230,479)
Adjustment upon final determination of level of performance goal achievement 6,503 [2]
Outstanding number of shares (Units), ending balance 4,677,788
Expected to vest, number of shares (Units) 4,004,697 [3]
Weighted Average Grant Date Fair Value  
Outstanding weighted average grant date fair value, beginning balance | $ / shares $ 31.07
Granted, weighted average grant date fair value | $ / shares 43.94
Vested, weighted average grant date fair value | $ / shares 25.21 [1]
Forfeited, weighted average grant date fair value | $ / shares 32.61
Adjustment upon final determination of level of performance goal achievement | $ / shares 34.72 [2]
Outstanding weighted average grant date fair value, ending balance | $ / shares $ 33.81
Maximum shares eligible to receive  
Outstanding maximum shares eligible to receive, beginning balance 6,058,464
Granted, maximum shares eligible to receive 679,354
Vested, maximum shares eligible to receive (1,496,377) [1]
Forfeited, maximum shares eligible to receive (230,479)
Adjustment upon final determination of level of performance goal achievement 6,503 [2]
Outstanding maximum shares eligible to receive, ending balance 5,017,465
[1] 1,496,377 PSUs that vested during the period were net settled upon vesting by issuing  902,532  shares (net of minimum statutory tax withholding).
[2] Represents an adjustment made in March 2020 to the number of shares subject to the PUs granted in 2019 upon certification of the level of achievement of the performance targets underlying such awards.
[3] The number of PUs expected to vest reflects the application of an estimated forfeiture rate.