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Income taxes - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Major components of tax expense income [line items]    
Deferred tax expense (income) relating to origination and reversal of temporary differences $ 30,242 $ 25,242
Tax losses 169,498 160,052
Deductible temporary differences for which deferred tax assets have not been recognized 25,242
Temporary differences associated with investments in subsidiaries 788,917 546,403
Turkey    
Major components of tax expense income [line items]    
Increase in deferred income tax expense due to exchange difference $ 8,099 $ 24,595