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Share-Based Payments - Performance Related Incentive Plan For Disruptive Growth Function - Additional Information (Detail) - Performance Share Unit [member]
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation number of shares issued 0 300,000
Share based arrangement vesting requirements These units vest after 5 years provided that a performance test is met