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Cash and cash equivalents (Details 2) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Cash and Cash Equivalents [Line Items]      
Long-term deposits $ 4,804,224 $ 14,955,778 $ 32,639,373
CLP [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Long-term deposits $ 4,804,224    
CLP [Member] | Banco Santander - Chile Due on January 05, 2017 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-27-2016  
Due date of deposits   01-05-2017  
Deposits monthly interest rate   0.33%  
Long-term deposits   $ 1,250,550  
CLP [Member] | Banco Santander - Chile Due on January 10, 2017 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-28-2016  
Due date of deposits   01-10-2017  
Deposits monthly interest rate   0.33%  
Long-term deposits   $ 2,400,792  
CLP [Member] | Banco Santander - Chile Due on January 25, 2017 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-29-2016  
Due date of deposits   01-25-2017  
Deposits monthly interest rate   0.34%  
Long-term deposits   $ 5,701,292  
CLP [Member] | Banco Santander - Chile Due on January 26, 2017 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-28-2016  
Due date of deposits   01-26-2017  
Deposits monthly interest rate   0.33%  
Long-term deposits   $ 5,401,782  
CLP [Member] | Banco Consorcio - Chile Due on January 06, 2016 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits     11-30-2015
Due date of deposits     01-06-2016
Deposits monthly interest rate     0.35%
Long-term deposits     $ 3,512,658
CLP [Member] | Banco Consorcio - Chile Due on January 20, 2016 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits     12-29-2015
Due date of deposits     01-20-2016
Deposits monthly interest rate     0.34%
Long-term deposits     $ 800,181
CLP [Member] | Banco Consorcio - Chile Due on January 25, 2016 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits     12-29-2015
Due date of deposits     01-25-2016
Deposits monthly interest rate     0.35%
Long-term deposits     $ 2,850,665
CLP [Member] | Banco Consorcio - Chile Due on January 12, 2016 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits     12-14-2015
Due date of deposits     01-12-2016
Deposits monthly interest rate     0.32%
Long-term deposits     $ 37,568
CLP [Member] | Banco Consorcio - Chile Due on January 29, 2016 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits     12-29-2015
Due date of deposits     01-29-2016
Deposits monthly interest rate     0.36%
Long-term deposits     $ 2,500,600
CLP [Member] | Banco de Credito e Inversiones - Chile Due on January 08, 2016 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits     12-15-2015
Due date of deposits     01-08-2016
Deposits monthly interest rate     0.33%
Long-term deposits     $ 7,762,889
CLP [Member] | Banco Santander - Chile Due on January 20, 2016 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits     12-21-2015
Due date of deposits     01-20-2016
Deposits monthly interest rate     0.35%
Long-term deposits     $ 6,407,467
CLP [Member] | Banco Consorcio - Chile1 Due on January 20, 2016 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits     12-21-2015
Due date of deposits     01-20-2016
Deposits monthly interest rate     0.34%
Long-term deposits     $ 460,521
CLP [Member] | Banco Santander - Chile1 Due on January 20, 2016 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits     12-23-2015
Due date of deposits     01-20-2016
Deposits monthly interest rate     0.34%
Long-term deposits     $ 1,251,133
CLP [Member] | Banco Santander - Chile Due on January 11, 2016 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits     12-24-2015
Due date of deposits     01-11-2016
Deposits monthly interest rate     0.33%
Long-term deposits     $ 1,651,271
CLP [Member] | Banco Santander - Chile Due on January 25, 2016 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits     12-28-2015
Due date of deposits     01-25-2016
Deposits monthly interest rate     0.34%
Long-term deposits     $ 3,301,122
CLP [Member] | Banco Consorcio - Chile [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-20-2017    
Due date of deposits 01-03-2018    
Deposits monthly interest rate 0.24%    
Long-term deposits $ 4,804,224    
CLP [Member] | HSBC Bank Chile [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits     12-17-2015
Due date of deposits     01-14-2016
Deposits monthly interest rate     0.33%
Long-term deposits     $ 2,103,298
ARS [Member] | Banco Frances - Argentina [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-12-2016  
Due date of deposits   01-11-2017  
Deposits monthly interest rate   1.60%  
Long-term deposits   $ 201,362