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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, 2020
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Nonvested at beginning of period, Shares | shares 1,235
Granted, Shares | shares 1,314
Vested, Shares | shares (1,087)
Forfeited, Shares | shares (22)
Nonvested at end of period, Shares | shares 1,440
Nonvested at beginning of period, Weighted-Average Grant Date Fair Value | $ / shares $ 6.66
Granted, Weighted-Average Grant Date Fair Value | $ / shares 1.39
Vested, Weighted-Average Grant Date Fair Value | $ / shares 4.85
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 8.38
Nonvested at end of period, Weighted-Average Grant Date Fair Value | $ / shares $ 3.18