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Share-based Compensation - Summary of Grants Awarded (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Grants 9,354,000
Exercised (6,141,302)
Canceled (2,275,990)
Outstanding 936,708
Exercible | $ $ 27.2
Grants on January 23, 2012 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Grants 4,860,000
Exercised (3,732,000)
Canceled (1,009,100)
Outstanding 118,900
Exercible | $ $ 11.5
Grants on March 20, 2013 [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Grants 4,494,000
Exercised (2,409,302)
Canceled (1,266,890)
Outstanding 817,808
Exercible | $ $ 15.7