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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
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