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Commitment and Contingencies (Nigeria Marketing Agent Litigation) - Additional Information (Detail) - 1 months ended Jun. 30, 2016 - Federal Government of Nigeria £ in Millions, NGN in Millions, $ in Millions	USD ($)	NGN	GBP (£)
Commitments and Contingencies Disclosure [Line Items]
Due to affiliates	$ 13.0
Loss contingency, damages awarded, value	5.3	NGN 1.9	£ 0.3
Loss contingency damages awarded, aggregate value	$ 5.5

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Commitments and Contingencies Disclosure [Line Items]

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Due to affiliates.

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Loss contingency damages awarded aggregate value.

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Amount of damages awarded to the plaintiff in the legal matter.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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