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Concession Financial and Sector Assets and Liabilities - Summary of Changes in Balances of Financial Assets and Liabilities (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018
Disclosure Of Financial Assets And Financial Liabilities With The Tariff Adjustments [abstract]
Percentage of operating revenue collected for reimbursement of additional tax	0.30%

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- Definition

Disclosure Of Financial Assets And Financial Liabilities With The Tariff Adjustments [abstract]

+ References

No definition available.

+ Details

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- Definition

Percentage of operating revenue.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration