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Property, plant and equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 4,227,397 $ 3,645,827
Impairment 447,808 0
Ending balance 3,988,476 4,227,397
Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 142,497 125,905
Ending balance 144,270 142,497
Plant and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 745,590 710,307
Ending balance 1,103,270 745,590
Capital works in progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 52,088 137,189
Ending balance 109,361 52,088
Mineral properties and leases [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 3,200,191 2,594,931
Ending balance 2,538,116 3,200,191
Capitalized Evaluation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 87,031 77,495
Ending balance 93,459 87,031
Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 6,347,014 5,678,378
Additions/transfers 363,436 349,090
Acquisition of Integra   393,647
Proceeds on pre-commercial production sales (48,868) (38,200)
Olympias commercial production transfers 13,288  
Other movements 14,566 (2,578)
Disposals (8,449) (33,323)
Ending balance 6,680,987 6,347,014
Cost [member] | Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 185,923 164,540
Additions/transfers 6,203 12,322
Acquisition of Integra   4,820
Proceeds on pre-commercial production sales 0 0
Olympias commercial production transfers 387  
Other movements (240) 4,251
Disposals (29) (10)
Ending balance 192,244 185,923
Cost [member] | Plant and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,531,640 1,416,948
Additions/transfers 119,712 115,684
Acquisition of Integra   3,646
Proceeds on pre-commercial production sales (9,179) 0
Olympias commercial production transfers 465,249  
Other movements 13,011 (2,325)
Disposals (8,400) (2,313)
Ending balance 2,112,033 1,531,640
Cost [member] | Capital works in progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 56,821 141,922
Additions/transfers 1,646 (42,933)
Acquisition of Integra   0
Proceeds on pre-commercial production sales 0 0
Olympias commercial production transfers 53,858  
Other movements 1,769 (12,336)
Disposals 0 (29,832)
Ending balance 114,094 56,821
Cost [member] | Mineral properties and leases [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 4,485,599 3,877,473
Additions/transfers 229,673 254,481
Acquisition of Integra   385,181
Proceeds on pre-commercial production sales (39,689) (38,200)
Olympias commercial production transfers (506,206)  
Other movements (200) 7,832
Disposals (20) (1,168)
Ending balance 4,169,157 4,485,599
Cost [member] | Capitalized Evaluation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 87,031 77,495
Additions/transfers 6,202 9,536
Acquisition of Integra   0
Proceeds on pre-commercial production sales 0 0
Olympias commercial production transfers 0  
Other movements 226 0
Disposals 0 0
Ending balance 93,459 87,031
Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (2,119,617) (2,032,551)
Depreciation for the year (95,548) (86,237)
Olympias commercial production transfers (13,288)  
Other movements (16,891) (2,514)
Impairment (447,808)  
Disposals 641 1,685
Ending balance (2,692,511) (2,119,617)
Depreciation and impairment losses [member] | Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (43,426) (38,635)
Depreciation for the year (3,125) (4,245)
Olympias commercial production transfers 0  
Other movements (1,060) (546)
Impairment (363)  
Disposals 0 0
Ending balance (47,974) (43,426)
Depreciation and impairment losses [member] | Plant and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (786,050) (706,641)
Depreciation for the year (88,649) (79,044)
Olympias commercial production transfers (13,288)  
Other movements (15,485) (2,048)
Impairment (105,932)  
Disposals 641 1,683
Ending balance (1,008,763) (786,050)
Depreciation and impairment losses [member] | Capital works in progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (4,733) (4,733)
Depreciation for the year 0 0
Olympias commercial production transfers 0  
Other movements 0 0
Impairment 0  
Disposals 0 0
Ending balance (4,733) (4,733)
Depreciation and impairment losses [member] | Mineral properties and leases [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,285,408) (1,282,542)
Depreciation for the year (3,774) (2,948)
Olympias commercial production transfers 0  
Other movements (346) 80
Impairment (341,513)  
Disposals 0 2
Ending balance (1,631,041) (1,285,408)
Depreciation and impairment losses [member] | Capitalized Evaluation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 0 0
Depreciation for the year 0 0
Olympias commercial production transfers 0  
Other movements 0 0
Impairment 0  
Disposals 0 0
Ending balance $ 0 $ 0