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Financial Instruments - Additional information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Lower and surpassed in financial indebtedness $ 439.2 $ 310.8
Financial indebtedness of short term 4.90% 9.30%
Average weighted term 5 years 6 months 6 years
Percentage of expected credit loss 1.90% 1.80%
Bottom of range [member] | Methodology [member]    
Disclosure of detailed information about financial instruments [line items]    
Risk Variable 25.00%  
Bottom of range [member] | Sensitivity analysis [member]    
Disclosure of detailed information about financial instruments [line items]    
Risk Variable 25.00%  
Top of range [member] | Methodology [member]    
Disclosure of detailed information about financial instruments [line items]    
Risk Variable 50.00%  
Top of range [member] | Sensitivity analysis [member]    
Disclosure of detailed information about financial instruments [line items]    
Risk Variable 50.00%