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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
t
Dec. 31, 2019
USD ($)
t
Disclosure of Commitments and Contingencies [Line Items]    
Capital commitment relating to the construction of factory building improvement and acquisition of machinery $ 2.5 $ 5.8
Corporate guarantee 17.0 38.5
Commitments in respect of management consulting services with related parties 0.1 0.3
Bottom of range [Member]    
Disclosure of Commitments and Contingencies [Line Items]    
Commitments to purchase raw materials $ 194.0 $ 200.0
Commitments to purchase raw materials, metric tons | t 28,736 20,996
Top of range [Member]    
Disclosure of Commitments and Contingencies [Line Items]    
Commitments to purchase raw materials $ 251.0 $ 290.0
Commitments to purchase raw materials, metric tons | t 35,946 30,580
Contingent liability for guarantees | Top of range [Member]    
Disclosure of Commitments and Contingencies [Line Items]    
Corporate guarantee $ 25.1 $ 24.7