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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Disclosure of detailed information about property, plant and equipment [Line Items]        
Impairment loss $ 11,000 $ 223,000 $ 2,524,000  
Carrying value of motor vehicles under financial leases 2,184,000     $ 4,882,000
Vehicles [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Carrying value of motor vehicles under financial leases $ 66,000 50,000 71,000  
Ningbo Pacific Cable Co., Ltd. [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Impairment loss   $ 223,000 1,131,000  
Siam Fiber Optics Co., Ltd. [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Impairment loss     1,393,000  
Recoverable amount of CGU     $ 0  
Key assumptions used in calculating the value in use, discount rate     14.80%