The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Period Type:	instant

Fair value measurement, Fair value measures for non-financial assets (Details) - MXN ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair value measurement [Abstract]
Non-financial assets	$ 3,781,084	$ 4,124,212	$ 11,923,301
Recurring [Member] \| Level 3 [Member]
Fair value measurement [Abstract]
Non-financial assets	2,167,826	2,544,881
Recurring [Member] \| Vessels [Member] \| Level 3 [Member]
Fair value measurement [Abstract]
Non-financial assets	782,673	1,118,250	$ 8,028,276
Recurring [Member] \| Buildings and Facilities [Member] \| Level 3 [Member]
Fair value measurement [Abstract]
Non-financial assets	238,901	242,204
Recurring [Member] \| Land [Member] \| Level 3 [Member]
Fair value measurement [Abstract]
Non-financial assets	$ 1,146,252	$ 1,184,427