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Financial results (Details) - CLP ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Financial results [Abstract]      
Finance income $ 5,050,952 $ 5,680,068 $ 7,845,743
Finance costs (24,166,313) (20,307,238) (23,101,329)
Foreign currency exchange differences 2,563,019 (456,995) (957,565)
Result as per adjustment units $ (110,539) $ (2,246,846) $ (3,282,736)