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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 20, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 21, 2020
Disclosure of transactions between related parties [Line Items]          
Other income   $ 1,173 $ 717 $ 1,817  
Immediate Holding Company [Member]          
Disclosure of transactions between related parties [Line Items]          
Income from discharge of liability       1,537  
Other income       $ 1,537  
Pacific Electric Wire & Cable Co., Ltd. [Member]          
Disclosure of transactions between related parties [Line Items]          
Secured loan procured         $ 6,000
Pacific Electric Wire & Cable Co., Ltd. [Member] | Loan Outstanding with Related Party [Member]          
Disclosure of transactions between related parties [Line Items]          
Secured loan period 12 months        
Secured loan fixed interest rate 3.00%        
Sigma Cable Company (Private) Limited [Member] | Pacific Electric Wire & Cable Co., Ltd. [Member] | Loan Outstanding with Related Party [Member]          
Disclosure of transactions between related parties [Line Items]          
Secured loan pledging ownership percentage 98.30%        
Bottom of range [Member] | PEWC Singapore Co. (Pte) Ltd. [Member]          
Disclosure of transactions between related parties [Line Items]          
Interest rates on the balance due to related party   1.23% 3.09%    
Top Of Range [Member] | PEWC Singapore Co. (Pte) Ltd. [Member]          
Disclosure of transactions between related parties [Line Items]          
Interest rates on the balance due to related party   2.90% 3.79%