Other assets, net - Additional Information (Details) (Detail) - MXN ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of other assets [line items]
Amortization expense for other assets	$ 24,348,182	$ 19,522,968	$ 15,000,875
Other assets [member]
Disclosure of other assets [line items]
Amortization expense for other assets	$ 620,680	$ 1,340,609	$ 558,457

The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_AmortisationExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration