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Income Taxes - Schedule of Unrecognized Deferred Income Tax Assets (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Unrecognized Deferred Income Tax Assets [Line Items]      
Unrecognized deferred income tax assets $ 437,673 $ 454,126 $ 432,222
Unused tax losses [Member]      
Disclosure Of Unrecognized Deferred Income Tax Assets [Line Items]      
Unrecognized deferred income tax assets 212,464 221,330 202,024
Unused tax credits [Member]      
Disclosure Of Unrecognized Deferred Income Tax Assets [Line Items]      
Unrecognized deferred income tax assets $ 225,209 $ 232,796 $ 230,198