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Income Taxes - Schedule of Unrecognized Deferred Income Tax Assets (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Unrecognized Deferred Income Tax Assets [Line Items]      
Unrecognized deferred income tax assets $ 406,240 $ 437,673 $ 454,126
Unused tax losses [Member]      
Disclosure Of Unrecognized Deferred Income Tax Assets [Line Items]      
Unrecognized deferred income tax assets 235,475 212,464 221,330
Unused tax credits [Member]      
Disclosure Of Unrecognized Deferred Income Tax Assets [Line Items]      
Unrecognized deferred income tax assets $ 170,765 $ 225,209 $ 232,796