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Subsequent Events - Additional Information (Detail) (Matcon Group Limited) In Millions, unless otherwise specified | 1 Months Ended |
--- | --- | ---
Jul. 31, 2012 USD ($) | Jul. 31, 2012 GBP (£) | Jul. 20, 2012 USD ($) | Jul. 20, 2012 GBP (£)
Subsequent Event [Line Items] |  |  |  |
Business acquisition, cash consideration paid |  |  | $ 37.5 | £ 24.0
Acquired entity, approximate annual revenue | $ 34.4 | £ 22.0 |  |

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