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Sale of China Business - Summary of Discontinued Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Discontinued Operations [line items] |  |
Net loss from discontinued operations | $ (2,797) | $ (339,369)
China Business [member] |  |
Disclosure of Discontinued Operations [line items] |  |
Revenue |  | 217,511
Production costs |  | 144,590
Depreciation and amortization |  | 19,067
Gross profit |  | 53,854
Exploration expenses |  | 1,257
General and administrative expenses |  | 20,999
Foreign exchange loss |  | 306
Operating profit |  | 31,292
Interest and financing costs |  | 169
Asset retirement obligation accretion |  | 356
Other expense |  | 2,713
Profit from discontinued operations before income tax |  | 28,054
Income tax expense |  | 16,189
Profit (loss) from discontinued operations |  | 11,865
Loss on sale of assets held for sale |  | 351,234
Net loss from discontinued operations |  | $ (339,369)

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