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Significant accounting judgments, estimates and assumptions (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred taxes
Available tax loss carry-forwards	$ 1,501,630	$ 111,083
Tax loss carry-forwards used	$ 16,378	$ 195,116	$ 1,618,850
Mexico
Deferred taxes
Period in which tax losses can be carried forward	10 years
Costa Rica
Deferred taxes
Period in which tax losses can be carried forward	3 years

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The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2017-01-01
-Paragraph 81
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Period in which tax losses can be carried forward against taxable income.

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