Summary of Significant Accounting Policies (Details 1)	12 Months Ended
	Dec. 31, 2012
Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	3
Minimum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	5
Minimum [Member] | Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	Lesser of lease term
Minimum [Member] | Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	5
Minimum [Member] | Equipment held under capital leases [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	5
Maximum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	40
Maximum [Member] | Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	15
Maximum [Member] | Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	7
Maximum [Member] | Equipment held under capital leases [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	10
Lease Agreements [Member] | Minimum [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	1 year
Lease Agreements [Member] | Maximum [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	18 years
Customer Lists [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	3 years
Contractual Rights [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	6 years
Trademarks [Member] | Minimum [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	2 years
Trademarks [Member] | Maximum [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	10 years
Developed Technology Rights [Member] | Minimum [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	5 years
Developed Technology Rights [Member] | Maximum [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	7 years
Non Compete Agreements [Member] | Minimum [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	2 years
Non Compete Agreements [Member] | Maximum [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	25 years
Animal Hospital [Member] | Customer Relationships [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	5 years
Laboratory [Member] | Customer Relationships [Member] | Minimum [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	5 years
Laboratory [Member] | Customer Relationships [Member] | Maximum [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	25 years
All Other Segments [Member] | Customer Relationships [Member] | Minimum [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	3 years
All Other Segments [Member] | Customer Relationships [Member] | Maximum [Member]
Property and equipment estimated useful lives
Amortization of intangible assets estimated useful lives	10 years