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Discontinued operations - Additional Information (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Oct. 27, 2021
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Disclosure of analysis of single amount of discontinued operations [line items]        
Impairment of property, plant and equipment     $ 13,926 $ 0
Tocantinzinho        
Disclosure of analysis of single amount of discontinued operations [line items]        
Cash received $ 20,000      
Sale of shares in disposition 46,926,372      
Percent of shares outstanding 19.90%      
Deferred cash consideration to be paid $ 60,000      
Deferral of deferred cash consideration to be paid (as a percent) 50.00%      
Cost of deferral of deferred cash consideration $ 5,000      
Deferred cash consideration to be paid upon first anniversary 30,000      
Deferred cash consideration to be paid upon second anniversary 35,000      
Impairment of property, plant and equipment     $ 160,140  
Fair value of disposal group $ 48,000      
Vila Nova        
Disclosure of analysis of single amount of discontinued operations [line items]        
Proceeds from sale of disposal group held for sale   $ 10,000    
Assets held for sale   11,800    
Liabilities included in disposal groups classified as held for sale   4,251    
Gain on disposition of mine   $ 2,451