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Income tax incurred and deferred: (Details 2) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014
Income taxes [Abstract] |  |  |  |  |
Consolidated income before IT and joint venture equity method: |  | $ 6,916,699 | $ 8,498,889 | $ 4,887,130 |
Net (loss) income before taxes of Airplan and Aerostar |  | (297,179) | 16,011 |  |
Net (loss) income before taxes of subsidiaries in Mexico not subject to IT |  | (89,685) | (62,327) | (56,415) |
Income before provisions for income taxes |  | $ 6,529,835 | $ 8,452,573 | $ 4,830,715 |
Statutory IT rate |  | 30.00% | 30.00% | 30.00% | 30.00%
IT that would result from applying the IT rate to book profit before income taxes |  | $ 1,958,951 | $ 2,535,772 | $ 1,449,214 |
Non-deductible items and other permanent differences |  | 15,126 | 8,693 | 11,908 |
Gain on business combination |  |  | (2,108,760) |  |
Goodwill impairment |  |  | 1,415,729 |  |
Annual adjustment for tax inflation |  | 12,101 | (2,406) | (10,974) |
Accounting disconnect inflation |  | (189,237) | (249,336) | (91,928) |
Recognition of deferred income tax at the Huatulco Airport | [1] |  |  | 44,020 |
Recognition for the year iin Aerostar | [2] | 33,879 | 28,678 |  |
Recognition for the year in Airplan | [2] | (17,117) | 10,214 |  |
Other non-taxable earnings |  | (17,742) | (3,137) | (1,056) |
IT provision |  | $ 1,795,961 | $ 1,635,447 | $ 1,401,184 |
Effective IT rate |  | 28.00% | 19.00% | 29.00% |
[1] | Based on the tax projections at December 31, 2017, the Huatulco Airport is expected to pay income tax in the future. Accordingly, the Company decided to recognize deferred income tax. This recognition increased the effective rate by 3%.
[2] | As of June 1, 2018, Aerostar consolidates into the Company and as of October 19, 2017, Airplan consolidates financially into the Company.

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