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Acquisitions - Allocation of Consideration Transferred (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Jun. 30, 2015
Feb. 27, 2015
Business Acquisition [Line Items]      
Goodwill $ 177.3 $ 177.2  
German Clinic [Member]      
Business Acquisition [Line Items]      
Current assets     $ 3.1
Real property     20.7
Equipment     1.6
Goodwill     8.1
Current liabilities     (4.4)
Long-term liabilities     (9.0)
Total purchase price     $ 20.1