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Share-Based Payments - Other Programs - Additional Information (Detail) - shares
shares in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Senior Management [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share based payment vesting period 6 months  
Vesting acceleration of stock options and restricted stock units 0.0 0.1
Long Term Restricted Stock Unit Program Three [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share based payment vesting period 5 years