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Non-controlling interests - Summary of Non-controlling Interests in Subsidiaries (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of subsidiaries [line items]    
Current assets $ 514,698 $ 737,517
Current liabilities (141,702) (114,030)
Carrying amount of NCI 63,414 79,940
Revenue 459,016 391,406
Net loss (379,631) (21,388)
Total comprehensive loss (382,775) (35,566)
Loss allocated to NCI (17,747) (11,453)
Net decrease in cash and cash equivalents $ (193,189) $ (403,670)
Hellas Gold SA ("Hellas") [member]    
Disclosure of subsidiaries [line items]    
NCI percentage 5.00% 5.00%
Current assets $ 78,308 $ 72,454
Non-current assets 1,846,952 2,143,089
Current liabilities (1,212,864) (1,113,471)
Non-current liabilities (160,765) (291,447)
Net assets 551,631 810,625
Carrying amount of NCI 17,619 31,732
Revenue 110,487 51,152
Net loss (298,272) (62,365)
Total comprehensive loss (298,272) (62,365)
Loss allocated to NCI (14,913) (3,118)
Dividends paid to NCI 0 0
Cash flows from operating activities (66,135) (9,253)
Cash flows from investing activities (80,306) (181,116)
Cash flows from financing activities 133,520 172,431
Net decrease in cash and cash equivalents $ (12,921) $ (17,938)
Deva Gold SA ("Deva") [member]    
Disclosure of subsidiaries [line items]    
NCI percentage 19.50% 19.50%
Current assets $ 2,177 $ 4,958
Non-current assets 414,330 413,989
Current liabilities (246,089) (234,386)
Non-current liabilities (43,581) (43,623)
Net assets 126,837 140,938
Carrying amount of NCI 44,169 46,919
Revenue 0 0
Net loss (14,100) (42,632)
Total comprehensive loss (14,100) (42,632)
Loss allocated to NCI (2,750) (8,314)
Dividends paid to NCI 0 0
Cash flows from operating activities (16,695) (51,328)
Cash flows from investing activities (419) (2,007)
Cash flows from financing activities 15,218 53,007
Net decrease in cash and cash equivalents $ (1,896) $ (328)