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Stock and Incentive Programs for Employees and Directors - Schedule of Nonvested Performance Share Units Activity (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Performance share units  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Nonvested at beginning of period, Shares | shares 1,546
Granted, Shares | shares 815
Vested, Shares | shares (144)
Forfeited, Shares | shares (141)
Nonvested at end of period, Shares | shares 2,076
Nonvested at beginning of period, Weighted-Average Grant Date Fair Value | $ / shares $ 7.21
Granted, Weighted-Average Grant Date Fair Value | $ / shares 1.61
Vested, Weighted-Average Grant Date Fair Value | $ / shares 16.30
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 13.64
Nonvested at end of period, Weighted-Average Grant Date Fair Value | $ / shares $ 3.94
Phantom Stock Units  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Nonvested at beginning of period, Shares | shares 2,313
Granted, Shares | shares 3,440
Vested, Shares | shares (665)
Forfeited, Shares | shares (485)
Nonvested at end of period, Shares | shares 4,603
Nonvested at beginning of period, Weighted-Average Grant Date Fair Value | $ / shares $ 5.87
Granted, Weighted-Average Grant Date Fair Value | $ / shares 2.36
Vested, Weighted-Average Grant Date Fair Value | $ / shares 5.77
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 3.96
Nonvested at end of period, Weighted-Average Grant Date Fair Value | $ / shares $ 3.25