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Related Party Transactions - Outstanding Balances and Transactions with Related Parties (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties $ 13,354 $ 12,573  
Amounts due to related parties 7,343 4,633  
Pacific Electric Wire & Cable Co., Ltd. [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 88 2,693  
Amounts due to related parties 1,019 457  
Purchases of materials 12,818 2,291 $ 3,706
Purchases of products 5,352 6,305 3,592
Sales 1,457 493 111
Fabrication Income received 208    
Management fee received   4 17
Management fee paid 143 145 241
Information technology service fee paid 114 118 97
PEWC, Singapore Branch [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 15 14  
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 1,008 993  
Interest expenses paid 15 11 9
PEWC (HK) [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 7,420 7,488  
Amounts due to related parties 2,394 88  
Purchases of materials 4,180 6,331 32,440
Sales 24,437 25,546 29,634
Immediate Holding Company [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due to related parties 1,537 1,537  
Siam Pacific Holding Company Limited [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 180 164  
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 5,651 2,214  
Sales 6,203 3,058 3,030
Construction of factory building expenses and acquisition of assets   285 2,605
Fujikura Limited [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due to related parties   131  
Purchases of products 1,115 1,064 $ 917
Others [Member]      
Disclosure of transactions between related parties [Line Items]      
Amounts due to related parties $ 23 $ 65