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Stock and Incentive Programs for Employees and Directors - Restricted Stock Units - Narrative (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unrecognized share-based compensation cost $ 4.7
Unrecognized compensation expense, weighted-average period of recognition 1 year 4 months 24 days
Restricted stock units  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unrecognized share-based compensation cost $ 2.3
Unrecognized compensation expense, weighted-average period of recognition 1 year 6 months