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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, 2018
$ / shares
shares
Performance share units  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Nonvested at beginning of period, Shares | shares 321
Granted, Shares | shares 683
Vested, Shares | shares (33)
Forfeited, Shares | shares (31)
Nonvested at end of period, Shares | shares 940
Nonvested at beginning of period, Weighted-Average Grant Date Fair Value | $ / shares $ 16.34
Granted, Weighted-Average Grant Date Fair Value | $ / shares 6.10
Vested, Weighted-Average Grant Date Fair Value | $ / shares 16.73
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 16.30
Nonvested at end of period, Weighted-Average Grant Date Fair Value | $ / shares $ 8.89
Phantom Stock Units  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Granted, Shares | shares 826
Forfeited, Shares | shares (64)
Nonvested at end of period, Shares | shares 762
Granted, Weighted-Average Grant Date Fair Value | $ / shares $ 8.73
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 8.73
Nonvested at end of period, Weighted-Average Grant Date Fair Value | $ / shares $ 8.73