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Bank Loans and Notes Payable - Summary of Financial Instruments by Type of Interest Rate (Parenthetical) (Detail) - U.S. dollars to Mexican pesos [member] $ in Millions | 12 Months Ended
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Dec. 31, 2018 MXN ($)
Cross-currency swaps [member] | Fixed rate debt [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Units of investment, percentage | 4.00%
Cross-currency swaps [member] | Variable rate debt [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Units of investment, percentage | 9.80%
Interest rate swap [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Notional amount | $ 11,403
Interest rate swap [member] | Fixed rate debt [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Interest rate percentage | 9.8
Interest rate swap [member] | Variable rate debt [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Interest rate percentage | 7.2

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