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Commitments and Contingencies - Additional Information (Detail) € in Millions, $ in Millions | 1 Months Ended | 115 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2007 EUR (€) | Jul. 31, 2011 USD ($) | Sep. 30, 2018 USD ($) | Apr. 30, 2008 EUR (€)
Loss Contingencies [Line Items] |  |  |  |
Amount related to unreserved tax-related matters, inclusive of interest (up to) | $ |  |  | $ 98 |
Ministry of Justice of Belgium |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, damages sought value | € | € 28.0 |  |  |
Counterclaim against termination of contract | € |  |  |  | € 18.5
Pharmaceutical Claims |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, damages sought value | $ |  | $ 68 |  |

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