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Basis of Preparation - Subsidiaries of the Company (Parenthetical) (Detail) - USD ($) $ in Thousands, shares in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 29, 2017 | Dec. 31, 2017 | Sep. 30, 2013 | Dec. 31, 2017 | Dec. 31, 2016
Additional paid-in capital [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Effect from the changes in shareholding percentage in subsidiary |  |  |  |  | $ (232) |
Charoong Thai Wire and Cable Public Company Limited [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of equity interest |  |  |  |  | 50.93% | 50.93%
Siam Fiber Optics Co., Ltd. [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of equity interest |  |  |  |  | 30.56% | 30.56%
Percentage of equity interest held by subsidiary |  |  |  |  | 60.00% |
Shanghai Yayang Electric Co., Ltd. [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of equity interest | 68.75% |  |  |  | 68.75% | 66.35%
Increase (decrease) in proportion of ownership interest in subsidiary | 2.40% |  |  |  |  |
Shanghai Yayang Electric Co., Ltd. [Member] | Crown Century Holdings Limited ("CCH (HK)") [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of equity interest | 37.92% | 31.42% |  |  |  |
Adjustments to additional paid in capital by conversion of loan | $ 1,000 |  |  |  |  |
Crown Century Holdings Limited ("CCH (HK)") [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of equity interest |  |  |  |  | 97.93% | 100.00%
Adjustments to additional paid in capital through issuance of converting preference shares |  |  |  | $ 2,000 |  |
Convertible preferred stock, shares issued for conversion |  |  | 7.8 |  | 7.8 |
Crown Century Holdings Limited ("CCH (HK)") [Member] | Preference shares [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Number of shares issued |  |  |  | 7.8 |  |
Crown Century Holdings Limited ("CCH (HK)") [Member] | Pacific Electric Wire & Cable (Shenzhen) Co., Ltd. [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of equity interest |  |  | 97.93% |  |  |
Increase (decrease) in proportion of ownership interest in subsidiary |  |  | (2.07%) |  |  |
Crown Century Holdings Limited ("CCH (HK)") [Member] | Australia Pacific Electric Cable Pty Limited [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of equity interest |  |  | 98.06% |  |  |
Increase (decrease) in proportion of ownership interest in subsidiary |  |  | (1.34%) |  |  |

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