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Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail)
R$ in Millions, $ in Millions
 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
BRL (R$)
Apr. 30, 2011
USD ($)
Apr. 30, 2011
BRL (R$)
Commitments and Contingencies Disclosure [Line Items]        
Fines assessed     $ 98.7 R$ 155
Maximum        
Commitments and Contingencies Disclosure [Line Items]        
Reducing remaining assessment $ 2.5 R$ 10