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Stockholders' Equity: (Tables) | 12 Months Ended
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Dec. 31, 2018
Share capital, reserves and other equity interest [Abstract] |
Disclosure of classes of share capital [text block] |
|  |  |  |  |  |  |  | Capital Stock as of |
|  | Total shares |  |  | December 31, |
Description |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |
“B” Series |  |  | 277,050,000 |  |  |  | 277,050,000 |  |  | Ps | 7,173,079 |  |  | Ps | 7,173,079 |
“BB” Series |  |  | 22,950,000 |  |  |  | 22,950,000 |  |  |  | 594,197 |  |  |  | 594,197 |
Total |  |  | 300,000,000 |  |  |  | 300,000,000 |  |  | Ps | 7,767,276 |  |  | Ps | 7,767,276 |

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- Definition The disclosure of classes of share capital. [Refer: Share capital [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a&doctype=Standard -URIDate 2018-03-16 + Details
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