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Commitments and contingencies - Income tax declaration for 2013 (Details)
 12 Months Ended
Dec. 31, 2019
PEN (S/)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
PEN (S/)
Dec. 31, 2020
USD ($)
Nov. 17, 2020
PEN (S/)
Nov. 17, 2020
USD ($)
Dec. 31, 2019
USD ($)
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 | Open tax procedure                  
Disclosure of Commitments and contingencies [Line Items]                  
Payments of tax debt         S/ 4,744,000 $ 1,311,000      
SUNAT | Year 2013 [Member] | Open tax procedure                  
Disclosure of Commitments and contingencies [Line Items]                  
Declared tax deductions not recognized S/ 148,730,000           $ 41,040,000    
Contingent liability     S/ 65,751,000 $ 18,143,000          
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
Disallowance of bonus paid to contractors S/ 2,067,000 $ 570,000