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Commitments and contingencies - Income tax declaration for 2014 (Details)
Dec. 31, 2020
PEN (S/)
Dec. 31, 2020
USD ($)
Dec. 31, 2018
PEN (S/)
Dec. 31, 2018
USD ($)
Disclosure of Commitments and contingencies [Line Items]        
Declared tax deductions not recognized   $ 1,100,000,000    
Contingent liability S/ 43,462,000 $ 11,993,000    
SUNAT | Tax year 2014 [Member] | Open tax procedure        
Disclosure of Commitments and contingencies [Line Items]        
Declared tax deductions not recognized     S/ 94,898,000 $ 26,186,000