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Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail) R$ in Millions, $ in Millions	1 Months Ended	6 Months Ended
	May 31, 2016 BRL (R$)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 BRL (R$)	Apr. 30, 2011 BRL (R$)
Commitments And Contingencies Disclosure [Abstract]
Fines assessed		$ 8.5		R$ 33.0
Fines assessed	R$ 3.0	0.8
Deposit Amount		1.5	R$ 6.0
Remaining amount of fines contested		$ 7.7	R$ 30.0