v3.10.0.1
Share-Based Payments - Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member]
shares in Thousands
12 Months Ended
Dec. 31, 2018
Employee
$ / shares
shares
Dec. 31, 2017
Employee
$ / shares
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 22,241  
Granted, shares 9,083  
Vested, shares [1] (3,701)  
Reinvested dividend equivalents, shares 974  
Forfeited, shares (1,321)  
Nonvested, end of period, shares 27,276 22,241
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 $ 32.64  
Granted, weighted-average grant-date fair value per share (in dollars per share) | $ / shares 35.90  
Vested, weighted-average grant date fair value per share (in dollars per share) | $ / shares [1] 34.02  
Reinvested dividend equivalents, weighted-average grant date fair value per share (in dollars per share) | $ / shares 38.96  
Forfeited, weighted-average grant date fair value per share (in dollars per share) | $ / shares 33.85  
Nonvested, end of period, weighted-average grant date fair value per share (in dollars per share) | $ / shares $ 33.70 $ 32.64
Number of shares modified to accelerate vesting 150 6,400
Number of employees affected by accelerated vesting | Employee 140 9,900
[1] Includes the modification of approximately 200 thousand PPSs to approximately 140 employees, including management employees, in connection with our Organizing for Growth initiative. The terms were modified to permit the vesting upon termination. The impact to compensation expense was immaterial.