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Employee benefit plans - Summary of Sensitivity of the Overall Pension Obligation to Changes in the Weighted Principal Assumptions (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption, increase (as a percent) 0.50%
Change in assumption, decrease (as a percent) 0.50%
Impact on overall obligation, due to 0.5 % increase in actuarial assumption $ (1,270)
Impact on overall obligation, due to 0.5 % decrease in actuarial assumption $ 1,422
Salary escalation rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption, increase (as a percent) 0.50%
Change in assumption, decrease (as a percent) 0.50%
Impact on overall obligation, due to 0.5 % increase in actuarial assumption $ 1,199
Impact on overall obligation, due to 0.5 % decrease in actuarial assumption $ (1,080)