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Commitments and Contingencies - Additional Information (Detail) In Millions, unless otherwise specified | 9 Months Ended | 0 Months Ended | 9 Months Ended | 45 Months Ended | 1 Months Ended | 9 Months Ended |  |  |  | 9 Months Ended | 33 Months Ended |
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Sep. 30, 2014 USD ($) | Sep. 30, 2014 Amr One Hundred One Contract | Apr. 30, 2014 BASF USD ($) | Sep. 30, 2014 BASF | Sep. 30, 2014 BASF USD ($) | Sep. 30, 2013 Chemport USD ($) | Jul. 31, 2011 Chemport USD ($) | Sep. 30, 2014 Chemport USD ($) | Dec. 31, 2013 Chemport USD ($) | Dec. 31, 2012 Chemport Anticipated investment before the end of 2012 USD ($) | Sep. 30, 2014 Chemport Maximum USD ($) | Sep. 30, 2014 Slanmhor USD ($) | Sep. 30, 2013 Slanmhor USD ($) | Sep. 30, 2014 Slanmhor USD ($) | Sep. 30, 2014 First Indication for AMR101 Laxdale Limited USD ($) | Sep. 30, 2014 First Indication for AMR101 Laxdale Limited GBP (£) | Sep. 30, 2014 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 USD ($) | Sep. 30, 2014 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 GBP (£) | Sep. 30, 2014 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 USD ($) | Sep. 30, 2014 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 GBP (£) | Sep. 30, 2014 Further Indication for AMR101 Laxdale Limited Maximum USD ($) | Sep. 30, 2014 Further Indication for AMR101 Laxdale Limited Maximum GBP (£)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of signed agreements |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment made under the agreements |  |  |  |  | $ 3.1 |  |  | $ 3.3 |  |  |  | $ 0.4 | $ 6.1 | $ 6.2 |  |  |  |  |  |  |  |
Supply agreement expiration date |  |  |  | 2014-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Refund received for material repurchases |  |  | 3.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential payment over the agreement terms | 54.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minority share equity investment commitment |  |  |  |  |  |  |  |  |  | 1.6 | 3.3 |  |  |  |  |  |  |  |  |  |  |
Cash paid for cost method investment |  |  |  |  |  |  | 1.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in supplier sold amount |  |  |  |  |  | 1.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carry amount of investment |  |  |  |  |  |  |  | 2.0 | 3.3 |  |  |  |  |  |  |  |  |  |  |  |  |
Potential aggregate stock or cash payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.2 | £ 7.5 | $ 8.1 | £ 5.0 | $ 8.1 | £ 5.0 | $ 16.2 | £ 10.0

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