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Investment in Subsidiaries - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of subsidiaries [line items] |  |
Profit (loss) allocated to non-controlling interests | $ (11,453) | $ (2,725)
Non-Material Subsidiaries [member] |  |
Disclosure of subsidiaries [line items] |  |
Profit (loss) allocated to non-controlling interests | $ (21) | $ 1,950

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