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Balances and transactions with related parties: Transactions (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related parties: |  |  |
Revenue | $ 12,624,731 | $ 16,821,638 | $ 15,410,241
Technical assistance (Note 15.4) | (175,615) | (404,086) | (386,249)
Leasing | (6,304) | (5,232) |
Autobuses de Oriente |  |  |
Related parties: |  |  |
Revenue | 7,968 | 14,349 | 14,455
Autobuses Golfo Pacfico |  |  |
Related parties: |  |  |
Revenue | 4,862 | 7,290 | 7,014
Coordinados de Mxico de Oriente, S. A. de C. V. |  |  |
Related parties: |  |  |
Revenue | 164 | 157 | 150
Related parties |  |  |
Related parties: |  |  |
Leasing | (6,061) | (5,340) | (5,232)
Cleaning services | $ (11,848) | $ (11,544) | $ (10,854)

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