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Segment information - Summary of Operating Segments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Information about profit and loss      
Revenue $ 459,016 $ 391,406  
Production costs 267,980 192,740  
Inventory write-down 1,465 444  
Depreciation 105,732 72,130  
Earnings from mine operations 83,839 126,092  
Other material items of income and expense      
Other write-down (write-up) of assets   46,697  
Impairment of property, plant, and equipment 447,808 0  
Exploration and evaluation expenses 33,842 38,261  
Income tax expense (recovery) (86,498) 19,383  
Additions to property, plant and equipment during the period 328,153 310,238  
Capitalised interest 36,750 36,750  
Information about assets and liabilities      
Property, plant and equipment 3,988,476 4,227,397 $ 3,645,827
Goodwill 92,591 92,591  
Information about assets and liabilities 4,081,067 4,319,988  
Debt 595,977 593,783  
Turkey [member]      
Information about profit and loss      
Revenue 348,528 337,907  
Production costs 174,081 145,573  
Inventory write-down 0 0  
Depreciation 75,854 71,389  
Earnings from mine operations 98,593 120,945  
Other material items of income and expense      
Other write-down (write-up) of assets   29,619  
Impairment of property, plant, and equipment 117,570    
Exploration and evaluation expenses 840 3,203  
Income tax expense (recovery) 45,238 30,139  
Additions to property, plant and equipment during the period 68,737 65,013  
Capitalised interest 0 0  
Information about assets and liabilities      
Property, plant and equipment 721,449 835,422  
Goodwill 0 0  
Information about assets and liabilities 721,449 835,422  
Debt 0 0  
Canada [member]      
Information about profit and loss      
Revenue 0 0  
Production costs 0 0  
Inventory write-down 0 0  
Depreciation 0 6  
Earnings from mine operations 0 (6)  
Other material items of income and expense      
Other write-down (write-up) of assets   0  
Impairment of property, plant, and equipment 0    
Exploration and evaluation expenses 103 6,616  
Income tax expense (recovery) (3,415) 1,532  
Additions to property, plant and equipment during the period 189,867 34,575  
Capitalised interest 13,160 1,245  
Information about assets and liabilities      
Property, plant and equipment 582,895 416,795  
Goodwill 92,591 92,591  
Information about assets and liabilities 675,486 509,386  
Debt 0 0  
Greece [member]      
Information about profit and loss      
Revenue 110,488 51,152  
Production costs 93,899 45,343  
Inventory write-down 1,465 444  
Depreciation 29,424 466  
Earnings from mine operations (14,300) 4,899  
Other material items of income and expense      
Other write-down (write-up) of assets   6,661  
Impairment of property, plant, and equipment 330,238    
Exploration and evaluation expenses 15,947 7,512  
Income tax expense (recovery) (129,213) (4,603)  
Additions to property, plant and equipment during the period 61,716 197,788  
Capitalised interest 23,590 35,505  
Information about assets and liabilities      
Property, plant and equipment 2,063,798 2,362,107  
Goodwill 0 0  
Information about assets and liabilities 2,063,798 2,362,107  
Debt 0 0  
Romania [member]      
Information about profit and loss      
Revenue 0 0  
Production costs 0 0  
Inventory write-down 0 0  
Depreciation 0 0  
Earnings from mine operations 0 0  
Other material items of income and expense      
Other write-down (write-up) of assets   10,454  
Impairment of property, plant, and equipment 0    
Exploration and evaluation expenses 13,499 10,168  
Income tax expense (recovery) (2,716) (8,026)  
Additions to property, plant and equipment during the period 419 2,006  
Capitalised interest 0 0  
Information about assets and liabilities      
Property, plant and equipment 416,197 415,856  
Goodwill 0 0  
Information about assets and liabilities 416,197 415,856  
Debt 0 0  
Brazil [member]      
Information about profit and loss      
Revenue 0 2,347  
Production costs 0 1,824  
Inventory write-down 0 0  
Depreciation 0 0  
Earnings from mine operations 0 523  
Other material items of income and expense      
Other write-down (write-up) of assets   (79)  
Impairment of property, plant, and equipment 0    
Exploration and evaluation expenses 1,728 4,733  
Income tax expense (recovery) 3,608 (1,087)  
Additions to property, plant and equipment during the period 6,612 10,029  
Capitalised interest 0 0  
Information about assets and liabilities      
Property, plant and equipment 203,075 196,467  
Goodwill 0 0  
Information about assets and liabilities 203,075 196,467  
Debt 0 0  
Other [member]      
Information about profit and loss      
Revenue 0 0  
Production costs 0 0  
Inventory write-down 0 0  
Depreciation 454 269  
Earnings from mine operations (454) (269)  
Other material items of income and expense      
Other write-down (write-up) of assets   42  
Impairment of property, plant, and equipment 0    
Exploration and evaluation expenses 1,725 6,029  
Income tax expense (recovery) 0 1,428  
Additions to property, plant and equipment during the period 802 827  
Capitalised interest 0 0  
Information about assets and liabilities      
Property, plant and equipment 1,062 750  
Goodwill 0 0  
Information about assets and liabilities 1,062 750  
Debt $ 595,977 $ 593,783