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Debt - Summary of Long Term Debt Maturities (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 646,139,058 $ 32,655 $ 625,194,144
2019 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 76,492,210    
2020 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 126,769,569    
2021 [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 42,453,673    
2022 and thereafter [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 400,423,606