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Financial risk management: (Tables) | 12 Months Ended
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Dec. 31, 2017
Financial risk management [Abstract] |
Disclosure of effect of changes in foreign exchange rates [text block] | At December 31, 2016 and 2017, the Company is exposed to exchange rate risk for monetary position, as shown below:
|  | December 31, |
|  | 2016 |  | 2017 |
Monetary position: |  |  |  |  |  |  |
Asset |  | USD | 188,765 |  | USD | 50,905 |
Liability |  |  | 218,125 |  |  | 148,417 |
|  | USD | (29,360) |  | USD | (97,512) |
Disclosure of maturity analysis for non-derivative financial liabilities [text block] | The amounts presented in the table reflect the undiscounted cash flows, including contractual interest.
|  | Under |  | Between 3 months |  | Between 1 |  | Between 2 and |
At December 31, 2017 |  | 3 months |  | and one year |  | and 2 years |  | 5 years |
Bank loans and interest |  | Ps | 177,080 |  | Ps | 606,433 |  | Ps | 880,357 |  | Ps | 12,146,826 |
Long term debt |  |  | 337,107 |  |  | 317,789 |  |  | 633,140 |  |  | 11,442,620 |
Suppliers |  |  | 428,881 |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  | 1,175,306 |  |  |  |  |  |  |  |  |  |
|  | Under |  | Between 3 months |  | Between 1 |  | Between 2 and |
At December 31, 2016 |  | 3 months |  | and one year |  | and 2 years |  | 5 years |
Bank loans and interest |  | Ps | 58,336 |  | Ps | 44,332 |  | Ps | 709,307 |  | Ps | 3,648,801 |
Suppliers |  |  | 11,401 |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  | 347,190 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about working capital of entity [Text Block] | The following table shows the Company's short term liquidity as of:
|  | December 31, |
|  | 2016 |  | 2017 |
Current assets |  | Ps | 4,233,018 |  | Ps | 5,787,862 |
Current liabilities |  |  | 593,183 |  |  | 2,408,649 |
Short term position (liquidity) |  | Ps | 3,639,835 |  | Ps | 3,379,213 |

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