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Post-Employment Obligation - Summary of Average Periods of the Obligations Under the Benefit Plans (Detail)
 12 Months Ended
Dec. 31, 2018
Plan A [member]  
Disclosure of Information About Maturity Profile of Defined Benefit Obligation [line items]  
Average periods of maturity of the obligations under the benefit plans 9 years 7 months 2 days
Plan B [member]  
Disclosure of Information About Maturity Profile of Defined Benefit Obligation [line items]  
Average periods of maturity of the obligations under the benefit plans 11 years 3 months 21 days
Health plan [member]  
Disclosure of Information About Maturity Profile of Defined Benefit Obligation [line items]  
Average periods of maturity of the obligations under the benefit plans 12 years 8 months 19 days
Dental plan [member]  
Disclosure of Information About Maturity Profile of Defined Benefit Obligation [line items]  
Average periods of maturity of the obligations under the benefit plans 12 years 8 months 1 day
Life insurance [member]  
Disclosure of Information About Maturity Profile of Defined Benefit Obligation [line items]  
Average periods of maturity of the obligations under the benefit plans 16 years 6 months