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Related Party Transactions - Outstanding Balances and Transactions with Related Parties (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties $ 12,061 $ 13,354  
Amounts due to related parties 2,997 7,342  
Pacific Electric Wire & Cable Co., Ltd. [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties   88  
Amounts due to related parties 45 1,019  
Purchases 521 18,170 $ 8,596
Sales 14 1,457 493
Fabrication Income received 412 208  
Management fee received     4
Management fee paid 136 143 145
Information technology service fee paid 115 114 118
PEWC, Singapore Branch [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 15 15  
Management fee received 14 14 14
PEWC Singapore Co. (Pte) Ltd. [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due to related parties 1,005 1,008  
Interest expenses paid 21 15 11
PEWC (HK) [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 5,989 7,420  
Amounts due to related parties 399 2,394  
Purchases 2,479 4,180 6,331
Sales 23,498 24,437 25,546
Service fee paid 231    
Immediate Holding Company [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due to related parties   1,537  
Income from discharge of liability 1,537    
Siam Pacific Holding Company Limited [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 181 180  
Amounts due to related parties 1,362 1,362  
Italian-Thai and affiliates [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 5,876 5,651  
Sales 6,814 6,203 3,058
Construction of factory building expenses and acquisition of assets     285
Fujikura Limited [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due to related parties 136    
Purchases 750 1,115 $ 1,064
Others [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due to related parties $ 50 $ 22