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Commitments and contingencies - Open tax procedures - l (Details) - Twenty-Second Administrative Litigation Court - Year 2008 [Member]
 1 Months Ended
Jan. 31, 2020
PEN (S/)
Dec. 31, 2019
Apr. 30, 2019
PEN (S/)
Dec. 31, 2020
PEN (S/)
Dec. 31, 2020
USD ($)
Jan. 31, 2020
USD ($)
Apr. 30, 2019
USD ($)
Disclosure of Commitments and contingencies [Line Items]              
Percentage of injunction of tax debt 60.00%   60.00%        
Letters of guarantee outstanding, amount     S/ 511,030,000       $ 141,013,000
Validity of letter of guarantee     12 months        
Tax debt S/ 892,682,000         $ 246,325,000  
New guarantee contract              
Disclosure of Commitments and contingencies [Line Items]              
Letters of guarantee outstanding, amount       S/ 535,609,000 $ 147,795,000    
Validity of letter of guarantee   12 months