XML 40 R30.htm IDEA: XBRL DOCUMENT

Nature of Operations (Details)	6 Months Ended
Nature of Operations (Details)	Jun. 30, 2011
Nature of Operations (Textuals) [Abstract]
Number of hospitals operated	530
Number of states in which hospitals are operated	41
Number of states in which the company operate a full-service veterinary diagnostic laboratory network	50
Number of laboratories operated	52