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Related Party Transactions - Outstanding Balances and Transactions with Related Parties (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties $ 13,965 $ 10,982  
Amounts due to related parties 11,865 10,620  
Pacific Electric Wire & Cable Co., Ltd. [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 24    
Amounts due to related parties 10,075 8,550  
Purchases 20,359 5,742 $ 2,745
Sales 5,254 90  
Fabrication Income received 25   140
Management fee paid 153 133 199
Information technology service fee paid 113 123 101
Training fee paid 110    
Interest expenses paid 91 60  
PEWC, Singapore Branch [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 21 22  
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 400 400  
Interest expenses paid   12 22
PEWC (HK) [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 7,204 5,613  
Amounts due to related parties 16 42  
Sales 25,127 17,004 17,831
Service fee paid 219 209 218
Siam Pacific Holding Company Limited [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 176 196  
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 6,540 5,151  
Amounts due to related parties   240  
Sales 6,613 5,344 4,188
Construction of factory building expenses and acquisition of assets 1,651 3,436 215
Others [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due to related parties 12 26  
Fabrication cost $ 350 $ 238 581
Fujikura Limited [Member]      
Disclosure of transactions between related parties [Line Items]      
Purchases     $ 249