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Share-based Compensation - Disclosure of Number and Weighted Average Exercise Prices of Share Options (Detail) - 12 months ended Dec. 31, 2018
shares in Thousands, R$ in Millions, $ in Millions
USD ($)
shares
BRL (R$)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Last sixty trading days Last sixty trading days
Grants on February 25, 2014 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date February 25, 2014 February 25, 2014
Grants on March 03, 2015 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date March 03, 2015 March 03, 2015
Grants on March 10, 2016 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date March 10, 2016 March 10, 2016
Grants on June 09, 2016 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date June 09, 2016 June 09, 2016
Grants on August 25, 2016 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date August 25, 2016 August 25, 2016
Grants on August 24, 2017 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date August 24, 2017 August 24, 2017
Grants On April Twelve Two Thousand Eighteen [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date April 12, 2018 April 12, 2018
Restricted virtual shares [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant value | $ $ 159.6  
Amount of virtual stock 7,586,202 7,586,202
Restricted virtual shares [member] | Grants on February 25, 2014 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant value | $ $ 30.4  
Amount of virtual stock 1,570,698 1,570,698
Restricted virtual shares [member] | Grants on March 03, 2015 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant value | $ $ 30.2  
Amount of virtual stock 1,237,090 1,237,090
Restricted virtual shares [member] | Grants on March 10, 2016 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant value | $ $ 31.1  
Amount of virtual stock 1,095,720 1,095,720
Restricted virtual shares [member] | Grants on June 09, 2016 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant value | $ $ 1.1  
Amount of virtual stock 55,994 55,994
Restricted virtual shares [member] | Grants on August 25, 2016 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant value | $ $ 1.1  
Amount of virtual stock 70,978 70,978
Restricted virtual shares [member] | Grants on August 24, 2017 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant value | $ $ 30.5  
Amount of virtual stock 1,930,350 1,930,350
Restricted virtual shares [member] | Grants On April Twelve Two Thousand Eighteen [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant value | $ $ 35.2  
Amount of virtual stock 1,625,372 1,625,372
Virtual performance shares [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Amount of virtual stock 2,448,179 2,448,179
Fair value of shares | R$   R$ 51.6
Virtual performance shares [member] | Grants on February 25, 2014 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Amount of virtual stock 175,100 175,100
Fair value of shares | R$   R$ 3.7
Virtual performance shares [member] | Grants on March 03, 2015 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Amount of virtual stock 546,024 546,024
Fair value of shares | R$   R$ 11.5
Virtual performance shares [member] | Grants on March 10, 2016 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Amount of virtual stock 541,595 541,595
Fair value of shares | R$   R$ 11.4
Virtual performance shares [member] | Grants on June 09, 2016 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Amount of virtual stock 32,674 32,674
Fair value of shares | R$   R$ 0.7
Virtual performance shares [member] | Grants on August 25, 2016 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Amount of virtual stock 43,783 43,783
Fair value of shares | R$   R$ 0.9
Virtual performance shares [member] | Grants on August 24, 2017 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Amount of virtual stock 762,782 762,782
Fair value of shares | R$   R$ 16.1
Virtual performance shares [member] | Grants On April Twelve Two Thousand Eighteen [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Amount of virtual stock 346,221 346,221
Fair value of shares | R$   R$ 7.3