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Acquisitions - Narrative (Details)
$ in Thousands
8 Months Ended 12 Months Ended
May 01, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Hospital
Dec. 31, 2016
Hospital
Dec. 31, 2015
Hospital
Dec. 31, 2014
Hospital
AVRL            
Business Acquisition [Line Items]            
Fair value of total consideration transferred   $ 21,000        
Companion Animal Practices, North America            
Business Acquisition [Line Items]            
Fair value of total consideration transferred $ 350,424   $ 5,400      
Number of hospitals acquired | Hospital     2 56 0 0
Percentage of Company acquired 80.00%          
Payments to acquire business $ 352,829