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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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