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Commitments - Summary of Authorized Investments (Detail)
$ in Thousands
Dec. 31, 2018
MXN ($)
Commitments [Line Items]  
Total authorised investments $ 5,478,614
Less Than One Year [member]  
Commitments [Line Items]  
Total authorised investments 1,412,232
Less Than Two Years [member]  
Commitments [Line Items]  
Total authorised investments 1,842,569
Less Than Three Years [member]  
Commitments [Line Items]  
Total authorised investments 1,157,684
Less Than Four Years [member]  
Commitments [Line Items]  
Total authorised investments 759,337
Later than four years and not later than five years [Member]  
Commitments [Line Items]  
Total authorised investments $ 306,792