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Related Party Transactions - Outstanding Balances and Transactions with Related Parties (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties $ 11,566 $ 12,061  
Due to related parties 3,284 2,997  
Pacific Electric Wire & Cable Co., Ltd. [Member]      
Disclosure of transactions between related parties [Line Items]      
Due to related parties 862 45  
Purchases 2,745 521 $ 18,170
Sales   14 1,457
Fabrication Income received 140 412 208
Management fee paid 199 136 143
Information technology service fee paid 101 115 114
PEWC, Singapore Branch [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 21 15  
Management fee received 14 14 14
PEWC Singapore Co. (Pte) Ltd. [Member]      
Disclosure of transactions between related parties [Line Items]      
Due to related parties 1,027 1,005  
Interest expenses paid 22 21 15
PEWC (HK) [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 5,247 5,989  
Due to related parties 20 399  
Purchases   2,479 4,180
Sales 17,831 23,498 24,437
Service fee paid 218 231  
Immediate Holding Company [Member]      
Disclosure of transactions between related parties [Line Items]      
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 196 181  
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 6,102 5,876  
Sales 4,188 6,814 6,203
Construction of factory building expenses and acquisition of assets 215    
Fujikura Limited [Member]      
Disclosure of transactions between related parties [Line Items]      
Due to related parties   136  
Purchases 249 750 $ 1,115
Others [Member]      
Disclosure of transactions between related parties [Line Items]      
Due to related parties $ 13 $ 50