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Employee benefit obligation - Additional information (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Discount rate  
Disclosure of defined benefit plans [line items]  
Percentage of reasonably possible increase in actuarial assumption 0.50%
Percentage of reasonably possible decrease in actuarial assumption 0.50%
Increase (decrease) due to a decrease in basis points $ (188)
Increase (decrease) due to a decrease in basis points $ 211
Price inflation  
Disclosure of defined benefit plans [line items]  
Percentage of reasonably possible increase in actuarial assumption 0.50%
Percentage of reasonably possible decrease in actuarial assumption 0.50%
Increase (decrease) due to a decrease in basis points $ 75
Increase (decrease) due to a decrease in basis points $ (73)