v3.19.3.a.u2
Share-Based Payments - Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member]
shares in Thousands
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2017
Employee
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Nonvested, beginning of period, shares 27,276  
Granted, shares 7,478  
Vested, shares (10,644)  
Reinvested dividend equivalents, shares 911  
Forfeited, shares (1,614)  
Nonvested, end of period, shares 23,407  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Nonvested, beginning of period, weighted-average grant date fair value per share (in dollars per share) | $ / shares $ 33.70  
Granted, weighted-average grant-date fair value per share (in dollars per share) | $ / shares 43.17  
Vested, weighted-average grant date fair value per share (in dollars per share) | $ / shares 31.66  
Reinvested dividend equivalents, weighted-average grant date fair value per share (in dollars per share) | $ / shares 39.64  
Forfeited, weighted-average grant date fair value per share (in dollars per share) | $ / shares 38.82  
Nonvested, end of period, weighted-average grant date fair value per share (in dollars per share) | $ / shares $ 37.54  
Number of shares modified to accelerate vesting   6,400
Number of employees affected by accelerated vesting | Employee   9,900