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Share-Based Payments - Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member]
shares in Thousands
12 Months Ended
Dec. 31, 2015
$ / 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 | shares 29,936
Granted, shares | shares 10,602
Vested, shares | shares (10,802)
Reinvested dividend equivalents, shares | shares 961
Forfeited, shares | shares (1,562)
Nonvested, end of period, shares | shares 29,135
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 $ 26.99
Granted, weighted-average grant-date fair value per share (in dollars per share) | $ / shares 34.40
Vested, weighted-average grant date fair value per share (in dollars per share) | $ / shares 22.04
Reinvested dividend equivalents, weighted-average grant date fair value per share (in dollars per share) | $ / shares 34.08
Forfeited, weighted-average grant date fair value per share (in dollars per share) | $ / shares 31.32
Nonvested, end of period, weighted-average grant date fair value per share (in dollars per share) | $ / shares $ 31.53