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FINANCIAL RISK MANAGEMENT - Foreign Currency Exposure (Details) - 12 months ended Dec. 31, 2017
$ in Thousands, $ in Millions
CLP ($)
country
USD ($)
Commodity price risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Percentage of reasonably possible risk increase 5.00%  
Decrease in income due to a reasonably possible increase in risk component $ (9,603,715)  
Purchase Type Risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Number of countries with operations | country 4  
Percentage of reasonably possible risk increase 5.00%  
Decrease in income due to a reasonably possible increase in risk component $ (6,533,169)  
Purchase Type Risk | Dollar    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Amount of risk exposure   $ 340.0
Amount of risk exposure percentage 19.00%  
Purchase Type Risk | Forward contract    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Derivative financial assets held for hedging   $ 62.8
Derivative forward horizon period 12 months  
Minimum | Commodity price risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Amount of risk exposure percentage 35.00%  
Maximum | Commodity price risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Amount of risk exposure percentage 40.00%