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Investment in Subsidiaries - Summary of Non-controlling Interests in Subsidiaries (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [line items]    
Current assets $ 737,517 $ 1,092,175
Current liabilities (114,140) (90,705)
Carrying amount of NCI 79,940 88,786
Net loss (21,388) (346,876)
Total comprehensive loss (35,566) (333,476)
Loss allocated to NCI (11,453) (2,725)
Net increase (decrease) in cash and cash equivalents $ (403,670) $ 594,982
Hellas Gold SA ("Hellas") [member]    
Disclosure of subsidiaries [line items]    
NCI percentage 5.00% 5.00%
Current assets $ 72,454 $ 80,251
Non-current assets 2,143,089 1,978,622
Current liabilities (1,113,471) (950,131)
Non-current liabilities (291,447) (298,488)
Net assets 810,625 810,254
Carrying amount of NCI 31,732 33,553
Revenue 51,152 40,631
Net loss (62,365) (67,712)
Total comprehensive loss (62,365) (67,712)
Loss allocated to NCI (3,118) (3,386)
Dividends paid to NCI 0 0
Cash flows from operating activities (9,253) (52,588)
Cash flows from investing activities (181,116) (208,031)
Cash flows from financing activities 172,431 288,982
Net increase (decrease) in cash and cash equivalents $ (17,938) $ 28,363
Deva Gold SA ("Deva") [member]    
Disclosure of subsidiaries [line items]    
NCI percentage 19.50% 19.50%
Current assets $ 4,958 $ 4,613
Non-current assets 413,989 412,082
Current liabilities (234,386) (189,548)
Non-current liabilities (43,623) (43,577)
Net assets 140,938 183,570
Carrying amount of NCI 46,919 55,233
Revenue 0 0
Net loss (42,632) (5,553)
Total comprehensive loss (42,632) (5,553)
Loss allocated to NCI (8,314) (1,289)
Dividends paid to NCI 0 0
Cash flows from operating activities (51,328) (6,037)
Cash flows from investing activities (2,007) (15,952)
Cash flows from financing activities 53,007 22,799
Net increase (decrease) in cash and cash equivalents $ (328) $ 810