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Stock and Incentive Programs for Employees and Directors - Schedule of Nonvested Performance Share Units Activity (Detail) - Performance share units
shares in Thousands
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Nonvested at beginning of period, Shares | shares 732
Forfeited, Shares | shares (46)
Vested, Shares | shares (95)
Equitable adjustment, Shares | shares (554)
Nonvested at end of period, Shares | shares 37
Nonvested at beginning of period, Weighted-Average Grant Date Fair Value | $ / shares $ 16.61
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 16.67
Vested, Weighted-Average Grant Date Fair Value | $ / shares 16.46
Equitable adjustment, Weighted-Average Grant Date Fair Value | $ / shares 16.59
Nonvested at end of period, Weighted-Average Grant Date Fair Value | $ / shares $ 16.73