Subsequent Events (Details) - Animal Hospital $ in Thousands	1 Months Ended	3 Months Ended
	May 09, 2017 USD ($) Hospital	Mar. 31, 2017 USD ($) Hospital	Mar. 31, 2016 USD ($) Hospital
Subsequent Event [Line Items]
Number of hospital acquired | Hospital		15	24
Total consideration		$ 91,695	$ 165,631
Subsequent Event
Subsequent Event [Line Items]
Number of hospital acquired | Hospital	7
Total consideration	$ 33,600
Acquired revenues	17,400
Real estate purchased in connection with hospital acquisition	$ 4,300