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Cash and cash equivalents (Details) $ in Thousands, $ in Thousands	Dec. 31, 2017 USD ($)	Dec. 31, 2017 MXN ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 MXN ($)	Dec. 31, 2015 MXN ($)	Dec. 31, 2014 MXN ($)
Cash and cash equivalents
Short-term investments		$ 5,982,314		$ 4,433,559
Cash in banks		963,162		2,632,878
Cash on hand		5,403		4,814
Total cash and cash equivalents	$ 352,204	$ 6,950,879	$ 358,303	$ 7,071,251	$ 5,157,313	$ 2,264,857

X

- Definition

The amount of cash balances held at banks.

+ References

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

- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References

No definition available.

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X

- Definition

The amount of cash held by the entity. This does not include demand deposits.

+ References

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X

- Definition

A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents]

+ References

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