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ACCOUNTING ESTIMATES AND JUDGMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Airport Slots [Member] | Air Transport CGU [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets with indefinite useful life | $ 964,513 | $ 978,849
Airport Slots [Member] | Coalition and Loyalty Program Multiplus CGU [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets with indefinite useful life |  |
Loyalty Program [Member] | Air Transport CGU [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets with indefinite useful life |  |
Loyalty Program [Member] | Coalition and Loyalty Program Multiplus CGU [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets with indefinite useful life | $ 321,440 | $ 326,262

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