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Material Partly-Owned Subsidiaries - Accumulated Balances and Profit / (Loss) of Material Non-controlling Interests in Subsidiaries (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of subsidiaries [Line Items] |  |  |
Non-controlling interests | $ 69,498 | $ 61,225 |
Profit/(loss) attributable to non-controlling interests | 4,808 | 3,172 | $ (1,417)
CTW Consolidated [Member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Non-controlling interests | 64,995 | 56,380 |
Profit/(loss) attributable to non-controlling interests | 4,896 | 3,812 | (789)
Shanghai Yayang Electric Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Non-controlling interests | 1,758 | 1,450 |
Profit/(loss) attributable to non-controlling interests | $ (15) | $ (181) | $ (364)

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