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Commitment and Contingencies (Nigeria Marketing Agent Litigation) - Additional Information (Detail) - Federal Government of Nigeria £ in Millions, NGN in Millions, $ in Millions | 1 Months Ended | 4 Months Ended
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Jun. 30, 2016 USD ($) | Jun. 30, 2016 NGN | Jun. 30, 2016 GBP (£) | Sep. 30, 2016 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Due to affiliates |  |  |  | $ 12.0
Loss contingency, damages awarded, value | $ 5.3 | NGN 1.9 | £ 0.3 |
Loss contingency damages awarded, aggregate value |  |  |  | $ 5.5

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