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Commitments and contingencies - Income tax declaration for 2014 (Details)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
PEN (S/)
Mar. 15, 2021
USD ($)
Mar. 15, 2021
PEN (S/)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
PEN (S/)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
PEN (S/)
Disclosure of Commitments and contingencies [Line Items]                
Declared tax deductions not recognized $ 252,157,000,000,000              
Contingent liability 9,902,000 S/ 39,590,000     $ 10,871,000 S/ 43,462,000    
SUNAT.                
Disclosure of Commitments and contingencies [Line Items]                
Contingent liability $ 2,626,000 S/ 10,500,000            
SUNAT. | Open tax procedure                
Disclosure of Commitments and contingencies [Line Items]                
Declared tax deductions not recognized     $ 34,826,000 S/ 139,235,000        
SUNAT. | Year 2014 [Member] | Open tax procedure                
Disclosure of Commitments and contingencies [Line Items]                
Declared tax deductions not recognized             $ 23,736,000 S/ 94,898,000