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Material Partly-Owned Subsidiaries - Subsidiaries with Material Non-controlling Interests (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
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% | 31.25%

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- Definition The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 12 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_12_c&doctype=Standard -URIDate 2018-03-16 + Details
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