XML 130 R107.htm IDEA: XBRL DOCUMENT v3.20.4
Stock and Incentive Programs for Employees and Directors - Stock Options - Narrative (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Unrecognized share-based compensation cost $ 4,700,000    
Stock options      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock options granted 0 0 0
Unrecognized share-based compensation cost $ 0