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Material Partly-Owned Subsidiaries - Subsidiaries with Material Non-controlling Interests (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
CTW Consolidated [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Place of incorporation and operations | Thailand |
Percentage of equity interest held by non-controlling interests | 49.07% | 49.07%
Shanghai Yayang Electric Co., Ltd. [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Place of incorporation and operations | The People's Republic of China |
Percentage of equity interest held by non-controlling interests | 31.25% | 33.65%

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