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Inventories - Summary of Classes of Inventories (Detail) - CLP ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Classes Of Inventories [Abstract]    
Supplies for Production $ 16,879,260 $ 12,377,179
Gas 2,301,172 2,159,901
Oil 2,593,805 2,556,438
Coal 11,984,283 7,660,840
Supplies for projects and spare parts 14,861,643 21,013,620
Total $ 31,740,903 $ 33,390,799