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Other Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012
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Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible asset capitalized | $ 181.6 | $ 175.5 | $ 149.0 | $ 106.2
Internally Developed Software [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible asset capitalized | $ 25.6 |  | $ 19.1 |

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