Commitments and contingencies, Commitments (Details) $ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2017 MXN ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 MXN ($)
Commitments [Abstract]
Concession fees	$ 17,589		$ 19,057
Capital contribution in joint venture	$ 113,777	$ 6,160
Capital contribution payment period for joint venture	3 years	3 years

The cash outflow to acquire interests in joint ventures (other than payments for those instruments considered to be cash equivalents or those held for dealing or trading purposes), classified as investing activities. [Refer: Joint ventures [member]]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2017-01-01
-Paragraph 16
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_16_c&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_OtherCashPaymentsToAcquireInterestsInJointVenturesClassifiedAsInvestingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration