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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)

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