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Fair Value Measurements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Money market funds carrying amount $ 5.5 $ 5.3
Carrying amount of cash surrender value of life insurance 15.9 17.1
Contingent consideration liabilities related to acquisitions $ 29.2 $ 43.0