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Segment information - Summary of Operating Segments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Information about profit and loss      
Metal sales from external customers $ 391,406 $ 432,727  
Production costs 192,740 194,669  
Inventory write-down 444    
Depreciation 72,130 74,887  
Gross profit 126,092 163,171  
Other material items of income and expense      
Write-down (write-up) of assets 46,697 4,529  
Exploration costs 38,261 18,773  
Income tax expense (recovery) 19,383 56,205  
Additions to property, plant and equipment during the period 346,988 298,504  
Information about assets and liabilities      
Property, plant and equipment 4,227,397 3,645,827 $ 4,747,759
Goodwill 92,591   $ 50,276
Information about assets and liabilities 4,319,988    
Debt 593,783 591,589  
Turkey [member]      
Information about profit and loss      
Metal sales from external customers 337,907 392,096  
Production costs 145,573 159,632  
Depreciation 71,389 74,061  
Gross profit 120,945 158,403  
Other material items of income and expense      
Write-down (write-up) of assets 29,619 626  
Exploration costs 3,203 2,278  
Income tax expense (recovery) 30,139 64,343  
Additions to property, plant and equipment during the period 65,013 65,674  
Information about assets and liabilities      
Property, plant and equipment 835,422 885,629  
Information about assets and liabilities 835,422    
Brazil [member]      
Information about profit and loss      
Metal sales from external customers 2,347    
Production costs 1,824    
Gross profit 523    
Other material items of income and expense      
Write-down (write-up) of assets (79) (798)  
Exploration costs 4,733 3,503  
Income tax expense (recovery) (1,087) (4,385)  
Additions to property, plant and equipment during the period 10,029 6,057  
Information about assets and liabilities      
Property, plant and equipment 196,467 186,606  
Information about assets and liabilities 196,467    
Greece [member]      
Information about profit and loss      
Metal sales from external customers 51,152 40,631  
Production costs 45,343 35,037  
Inventory write-down 444    
Depreciation 466 543  
Gross profit 4,899 5,051  
Other material items of income and expense      
Write-down (write-up) of assets 6,661 4,701  
Exploration costs 7,512 3,091  
Income tax expense (recovery) (4,603) (1,355)  
Additions to property, plant and equipment during the period 233,293 210,770  
Information about assets and liabilities      
Property, plant and equipment 2,362,107 2,157,822  
Information about assets and liabilities 2,362,107    
Romania [member]      
Information about profit and loss      
Depreciation   2  
Gross profit   (2)  
Other material items of income and expense      
Write-down (write-up) of assets 10,454    
Exploration costs 10,168 1,892  
Income tax expense (recovery) (8,026) (1,053)  
Additions to property, plant and equipment during the period 2,006 15,953  
Information about assets and liabilities      
Property, plant and equipment 415,856 413,949  
Information about assets and liabilities 415,856    
Other [member]      
Information about profit and loss      
Depreciation 269 281  
Gross profit (269) (281)  
Other material items of income and expense      
Write-down (write-up) of assets 42    
Exploration costs 6,029 8,009  
Income tax expense (recovery) 1,428 (1,345)  
Additions to property, plant and equipment during the period 827 50  
Information about assets and liabilities      
Property, plant and equipment 750 1,821  
Information about assets and liabilities 750    
Debt 593,783 $ 591,589  
Canada [member]      
Information about profit and loss      
Depreciation 6    
Gross profit (6)    
Other material items of income and expense      
Exploration costs 6,616    
Income tax expense (recovery) 1,532    
Additions to property, plant and equipment during the period 35,820    
Information about assets and liabilities      
Property, plant and equipment 416,795    
Goodwill 92,591    
Information about assets and liabilities $ 509,386