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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
t
Dec. 31, 2018
USD ($)
t
Disclosure of finance lease and operating lease by lessee [Line Items]    
Leased motor vehicle to secure finance lease liabilities, average discount interest rate   5.18%
Capital commitment relating to the construction of factory building improvement and acquisition of machinery $ 5.8 $ 0.6
Corporate guarantee 38.5 36.9
Commitments in respect of management consulting services with related parties 0.3 $ 0.2
Bottom of range [Member]    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Non-cancellable operating lease arrangements terms   1 year
Commitments to purchase raw materials $ 200.0 $ 136.0
Commitments to purchase raw materials, metric tons | t 20,996 22,450
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 $ 290.0 $ 176.0
Commitments to purchase raw materials, metric tons | t 30,580 28,940
Contingent liability for guarantees | Top of range [Member]    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Corporate guarantee $ 24.7 $ 24.3
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 $ 0.0 $ 2.0