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Business Combinations - Additional Information (Detail) (Encore Health Resources, LLC [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Encore Health Resources, LLC [Member]
 
Business Acquisition [Line Items]  
Business acquisition through merger $ 91.5
Date of Acquisition Completed Jul. 01, 2014
Cash acquired $ 2.2