Other accounts receivable, net - Movement in the allowance for doubtful accounts (Details) - MXN ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other accounts receivable, net
Balance as of beginning of the year	$ (19,317)	$ (24,612)	$ (27,786)
Write-offs	6,228	14,459	11,999
Increase in allowance	(4,720)	(9,164)	(8,825)
Balance as of end of the year	$ (17,809)	$ (19,317)	$ (24,612)

The amount of impairment loss recognised in profit or loss for trade receivables. [Refer: Impairment loss recognised in profit or loss; Trade receivables]

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

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