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INTANGIBLE ASSETS OTHER THAN GOODWILL (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of changes in intangible assets other than goodwill [Roll Forward]      
Opening balance $ 1,610,313 $ 1,321,425 $ 1,880,079
Additions 87,333 90,360 53,224
Withdrawals (928) (927) (4,775)
Transfer software 203 10,653 (1,700)
Foreing exchange (21,264) 239,059 (568,667)
Amortization (58,410) (50,257) (36,736)
Closing balance 1,617,247 1,610,313 1,321,425
Computer Software [Member]      
Reconciliation of changes in intangible assets other than goodwill [Roll Forward]      
Opening balance 157,016 104,258 126,797
Additions 8,453 6,688 4,954
Withdrawals (244) (736) (4,612)
Transfer software 45,783 85,029 28,726
Foreing exchange (1,215) 5,689 (14,871)
Amortization (48,823) (43,912) (36,736)
Closing balance 160,970 157,016 104,258
Developing Software [Member]      
Reconciliation of changes in intangible assets other than goodwill [Roll Forward]      
Opening balance 91,053 74,887 74,050
Additions 78,880 83,672 48,270
Withdrawals (684) (191) (162)
Transfer software (45,580) (74,376) (30,426)
Foreing exchange (254) 7,061 (16,845)
Amortization
Closing balance 123,415 91,053 74,887
Airport Slots [Member]      
Reconciliation of changes in intangible assets other than goodwill [Roll Forward]      
Opening balance [1] 978,849 816,987 1,201,028
Additions [1]
Withdrawals [1]
Transfer software [1]
Foreing exchange [1] (14,336) 161,862 (384,041)
Amortization [1]
Closing balance [1] 964,513 978,849 816,987
Trademarks and Loyalty Program [Member]      
Reconciliation of changes in intangible assets other than goodwill [Roll Forward]      
Opening balance [1],[2] 383,395 325,293 478,204
Additions [1],[2]    
Withdrawals [1],[2]   (1)
Transfer software [1],[2]    
Foreing exchange [1],[2] (5,459) 64,447 (152,910)
Amortization [1],[2] (9,587) (6,345)  
Closing balance [1],[2] $ 368,349 $ 383,395 $ 325,293
[1] See Note 2.5
[2] In 2016, after the extensive work of integration after the association between LAN and TAM, during which there has been solid progress in the homologation of the optimization processes of its air connections, in addition to the restructuring and modernization of the fleet of aircraft, the Company has resolved adopt a unique name and identity, and announce that the brand of the group will be LATAM ", which would unite all companies under a single image.