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Intangible assets, net (Details) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 MXN ($)	Dec. 31, 2016 MXN ($)	Dec. 31, 2015 MXN ($)
Composition and movement of intangible assets
Beginning balance		$ 114,041	$ 94,649
Additions		130,908	60,792
Disposals		(1,976)	(1,277)
Amortization		(52,396)	(40,290)
Exchange differences		(157)	167
Ending balance	$ 9,649	190,420	114,041	$ 94,649
Software
Composition and movement of intangible assets
Beginning balance		114,041
Ending balance		190,420	114,041
Amortization expense		52,396	40,290	$ 31,278
Software | Gross value
Composition and movement of intangible assets
Beginning balance		313,028
Ending balance		441,803	313,028
Software | Accumulated depreciation / amortization
Composition and movement of intangible assets
Beginning balance		(198,987)
Ending balance		$ (251,383)	$ (198,987)
Software | Minimum
Composition and movement of intangible assets
Estimated useful lives (in years)	1 year	1 year	1 year
Software | Maximum
Composition and movement of intangible assets
Estimated useful lives (in years)	4 years	4 years	4 years

X

- Definition

The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill]

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

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The decrease in intangible assets other than goodwill resulting from disposals. [Refer: Intangible assets other than goodwill]

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The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill]

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