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Income taxes (Details textual) - CLP ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
IncomeTaxes [Line Items]                
Applicable tax rate     27.00% 25.50% 24.00%      
Description of expiry date of deductible temporary differences, unused tax losses and unused tax credits     In accordance with current tax laws in Chile, tax losses do not expire and can be applied indefinitely. Argentina, Uruguay and Paraguay tax losses expire after 5 years and Bolivia tax losses expire after 3 years​​​​​​​.          
Revaluation Of Assets Terms And Condition One     the remaining useful life of the assets to be re-evaluated can never be less than 5 years.          
Revaluation Of Assets Terms And Condition Two     In the case of sale in the first two years, the value of the revaluation to be considered is reduced by 60% (first year) or 30% (second year)          
Property, plant and equipment, revaluation surplus     $ 6,821,753          
Bottom of range [member]                
IncomeTaxes [Line Items]                
Special Tax On Revaluation Value     8.00%          
Top of range [member]                
IncomeTaxes [Line Items]                
Special Tax On Revaluation Value     10.00%          
CHILE                
IncomeTaxes [Line Items]                
Applicable tax rate       25.50% 24.00% 22.50% 21.00% 20.00%
CHILE | Scenario plan for tax rate [Member]                
IncomeTaxes [Line Items]                
Applicable tax rate     27.00%          
ARGENTINA                
IncomeTaxes [Line Items]                
Applicable tax rate   35.00%            
Applicable excise tax rate       8.00%        
Earnings retention ratio 13.00% 0.00%            
ARGENTINA | Scenario plan for tax rate [Member]                
IncomeTaxes [Line Items]                
Applicable tax rate 25.00% 30.00% 25.00%          
Applicable excise tax rate     14.00%          
Earnings retention ratio   7.00% 13.00%          
April 2014 [Member]                
IncomeTaxes [Line Items]                
Receivable related to first category income tax refunds     $ 968,195