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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]    
Money market funds carrying amount $ 18.7 $ 5.1
Carrying amount of cash surrender value of life insurance 14.3 16.0
Contingent consideration liabilities related to acquisitions $ 29.0 $ 35.3