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Non-controlling interests - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of subsidiaries [line items]    
Profit (loss) allocated to non-controlling interests $ (6,901) $ (17,747)
Carrying amount of NCI 59,304 63,414
Non-Material Subsidiaries    
Disclosure of subsidiaries [line items]    
Profit (loss) allocated to non-controlling interests (247) (84)
Carrying amount of NCI $ 3,039 $ 1,626