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Stockholders' Equity: (Details Textual) - MXN ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Apr. 26, 2018 | Dec. 31, 2017 | Apr. 26, 2017
Issued capital | $ 7,767,276 |  | $ 7,767,276 |
Legal Reserve, Percentage of Allocation from Net Income | 5.00% |  |  |
Capital redemption reserve | $ 9,862,262 |  | 7,052,635 |
Dividend payables |  | $ 2,034,000 |  | $ 1,848,000
Dividend Declared, Tax on Dividends, Percentage | 42.86% |  |  |
Retained earnings | $ 9,919,989 |  | 9,949,654 |
Additional paid-in capital | $ 41,606,425 |  | 39,689,426 |
Capital Stock Issued And Outstanding Reserve | 20.00% |  |  |
Fixed Capital Shares [member] |  |  |  |
Issued capital | $ 1,000 |  | 1,000 |
Variable Capital Shares [member] |  |  |  |
Issued capital | $ 7,767,276 |  | $ 7,767,276 |

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