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Acquisitions - Narrative (Details)
12 Months Ended
Mar. 31, 2015
USD ($)
Aug. 15, 2014
USD ($)
Dec. 31, 2015
USD ($)
day_care_location
province
State
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Business Acquisition [Line Items]          
Number of Canadian Provinces in which entity operates | province     4    
Camp Bow Wow [Member]          
Business Acquisition [Line Items]          
Number of dog boarding and daycare service locations operated | day_care_location     126    
Number of states in which the entity operates | State     34    
Number of Canadian Provinces in which entity operates | province     1    
Animal Hospitals And Laboratory Acquisitions [Member]          
Business Acquisition [Line Items]          
Fair value of total consideration transferred     $ 170,717,000 $ 135,266,000 $ 57,425,000
AVRL [Member]          
Business Acquisition [Line Items]          
Fair value of total consideration transferred $ 21,000,000        
D.O.G. Enterprises, LLC [Member]          
Business Acquisition [Line Items]          
Fair value of total consideration transferred   $ 17,757,000      
Percentage of Company acquired   100.00%      
Payments to acquire business, in US dollars   $ 17,000,000      
Maximum additional consideration to be earned   $ 3,000,000.0      
Additional consideration earned, period   3 years