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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
t
Dec. 31, 2016
USD ($)
t
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items]    
Leased machinery and equipment at cost used to secure finance lease liabilities, average discount interest rate 5.11% 4.98%
Capital commitment relating to the construction of factory building improvement and acquisition of machinery $ 800 $ 200
Corporate guarantee 35,200 29,000
Commitments in respect of repair and maintenance consulting services with related parties $ 100 100
Bottom of range [Member]    
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items]    
Non-cancellable operating lease arrangements terms 5 years  
Commitments to purchase raw materials $ 175,000 $ 111,000
Commitments to purchase raw materials, metric tons | t 24,005 19,620
Top of range [Member]    
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items]    
Non-cancellable operating lease arrangements terms 30 years  
Commitments to purchase raw materials $ 277,000 $ 203,000
Commitments to purchase raw materials, metric tons | t 37,930 35,920
Contingent liability for guarantees | Top of range [Member]    
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items]    
Corporate guarantee $ 31,200 $ 31,200
Charoong Thai Wire and Cable Public Company Limited [Member] | Contingent liability for guarantees    
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items]    
Corporate guarantee 2,000 2,000
Machinery and equipment [Member]    
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items]    
Leased machinery and equipment at cost used to secure finance lease liabilities 148 131
Machinery and equipment [Member] | Accumulated depreciation [Member]    
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items]    
Leased machinery and equipment at cost used to secure finance lease liabilities $ 98 $ 60