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Stock and Incentive Programs for Employees and Directors - Nonvested Restricted Stock Unit Awards (Detail) - Restricted stock 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 1,670
Granted, Shares | shares 1,746
Vested, Shares | shares (730)
Forfeited, Shares | shares (118)
Equitable adjustment, Shares | shares (1,735)
Nonvested at end of period, Shares | shares 833
Nonvested at beginning of period, Weighted-Average Grant Date Fair Value | $ / shares $ 13.72
Granted, Weighted-Average Grant Date Fair Value | $ / shares 14.97
Vested, Weighted-Average Grant Date Fair Value | $ / shares 12.37
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 14.56
Equitable adjustment, Weighted-Average Grant Date Fair Value | $ / shares 13.77
Nonvested at end of period, Weighted-Average Grant Date Fair Value | $ / shares $ 17.23