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Property, Plant and Equipment - Additional Information (Detail) ¥ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |  |
Impairment loss |  |  | $ 223,000 | $ 2,524,000 | $ 0
Borrowing cost capitalized |  |  | 0 | 0 | 0
Vehicles [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |  |
Carrying value of motor vehicles under financial leases |  |  | 50,000 | 71,000 | $ 64,000
Ningbo Pacific Cable Co., Ltd. [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |  |
Impairment loss |  |  | $ 200,000 | 1,100,000 |
Consideration amount within agreement to sell its buildings and land use rights at its Ningbo Pacific subsidiary | $ 8,800,000 | ¥ 60.6 |  |  |
Tax expense related to sale of building and land use rights | $ 800,000 |  |  |  |
Siam Fiber Optics Co., Ltd. [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |  |
Impairment loss |  |  |  | 1,400,000 |
Recoverable amount of CGU |  |  |  | $ 0 |
Key assumptions used in calculating the value in use, discount rate |  |  |  | 14.80% |

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