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Acquisitions and Divestitures - Sale of China Business - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
May 16, 2016 | Apr. 26, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about business combination [line items] |  |  |  |
Net loss from discontinued operations |  |  | $ (2,797) | $ (339,369)
China Business [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Net loss from discontinued operations |  |  |  | (339,369)
Loss on sale of assets held for sale |  |  |  | $ (351,234)
Working capital adjustment |  |  | $ 2,800 |
China Business [member] | Jinfeng [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Percentage of interests in a subsidiary |  | 82.00% |  |
Proceeds from sale of interests in subsidiary |  | $ 300,000 |  |
China Business [member] | White Mountain, Tanjianshan and Eastern Dragon [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Proceeds from sale of interests in subsidiary | $ 600,000 |  |  |

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