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Property, plant and equipment - Detail net of accumulated depreciation and impairment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of the year $ 917,974 $ 781,606
Additions (37,270) (15,512)
Disposals and other (7,706) (9,074)
Exchange differences (41,230) 43,982
Business combinations 62,487  
Business disposals (5,393)  
Additions to the scope of consolidation   18,730
Transfer from assets and disposal groups classified as held for sale   98,242
Property, plant and equipment at end of the year 888,862 917,974
Gross carrying amount | Land and buildings    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of the year 251,298 191,058
Additions 2,983 1,665
Disposals and other (4,687) (202)
Transfers from/(to) other accounts 24,823 5,228
Exchange differences (10,743) 16,843
Business combinations 6,846  
Business disposals (35,211)  
Additions to the scope of consolidation   1,648
Transfer from assets and disposal groups classified as held for sale   35,058
Property, plant and equipment at end of the year 235,309 251,298
Gross carrying amount | Plant and Machinery    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of the year 1,490,804 1,220,055
Additions 9,104 1,849
Disposals and other (34,612) (56,475)
Transfers from/(to) other accounts 69,439 49,892
Exchange differences (74,554) 96,709
Business combinations 53,337  
Business disposals (26,471)  
Additions to the scope of consolidation   97
Transfer from assets and disposal groups classified as held for sale   178,677
Property, plant and equipment at end of the year 1,487,047 1,490,804
Gross carrying amount | Other Fixtures, Tools and Furniture    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of the year 8,533 5,972
Additions 12 2,262
Disposals and other (1,084) (607)
Transfers from/(to) other accounts 4,850 377
Exchange differences (405) 450
Business combinations 82  
Business disposals (43)  
Transfer from assets and disposal groups classified as held for sale   79
Property, plant and equipment at end of the year 11,945 8,533
Gross carrying amount | Advances Property, Plant and Equipment in the Course of Construction    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of the year 128,584 49,865
Additions 99,016 71,204
Disposals and other (2,657) (1,029)
Transfers from/(to) other accounts (97,086) (58,480)
Exchange differences (5,941) 9,225
Business combinations 1,790  
Business disposals (342)  
Additions to the scope of consolidation   16,985
Transfer from assets and disposal groups classified as held for sale   40,814
Property, plant and equipment at end of the year 123,364 128,584
Gross carrying amount | Mineral Reserves    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of the year 60,359 59,989
Transfers from/(to) other accounts   (90)
Exchange differences (951) 460
Property, plant and equipment at end of the year 59,408 60,359
Gross carrying amount | Other Items of Property, Plant and Equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of the year 32,364 32,203
Additions 4,293 1,455
Disposals and other (587) (164)
Transfers from/(to) other accounts 222 (58)
Exchange differences (383) (1,072)
Business combinations 432  
Property, plant and equipment at end of the year 36,341 32,364
Accumulated depreciation and amortisation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of the year (936,325) (665,507)
Additions (109,832) (94,051)
Disposals and other 35,921 49,403
Transfers from/(to) other accounts (2,248) 3,131
Exchange differences 48,455 (73,575)
Business disposals 56,674  
Transfer from assets and disposal groups classified as held for sale   (155,726)
Property, plant and equipment at end of the year (907,355) (936,325)
Accumulated impairment    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of the year (117,643) (112,029)
Additions (42,846) 104
Exchange differences 3,292 (5,058)
Transfer from assets and disposal groups classified as held for sale   (660)
Property, plant and equipment at end of the year $ (157,197) $ (117,643)