Commitments and Contingencies (Details Textual) (USD $)	0 Months Ended	12 Months Ended
	May 07, 2014 claim	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 18, 2014
Loss Contingencies [Line Items]
Minimum Period Of Lease Including Renewal Options Operating Leases		5 years
Maximum Period Of Lease Including Renewal Options Operating Leases		35 years
Commitments and Contingencies (Textual) [Abstract]
Total rent expense		$ 69,700,000	$ 67,600,000	$ 66,000,000
Total rental income		1,200,000	1,000,000	1,000,000
Purchase commitments of products and services through 2019		32,700,000
Potential earnout payment		5,800,000
Earn-out contingent consideration		3,200,000	2,200,000
Total outstanding holdbacks		4,700,000	900,000
Amount paid to sellers for unused portion of holdbacks		700,000	2,400,000	2,700,000
Number of claims dismissed	4
Jorge Duran vs. VCA Animal Hospitals [Member]
Commitments and Contingencies (Textual) [Abstract]
Total number of claims	8
Chris Lopez vs. Logistics Delivery Solutions, LLC [Member]
Commitments and Contingencies (Textual) [Abstract]
Settlement agreement, maximum amount					1,250,000
California Wildfire [Member]
Commitments and Contingencies (Textual) [Abstract]
Loss recorded in connection with unusual event		18,900,000
Insurance proceeds received		20,000,000
Gain from unusual event		1,100,000
Insurance receivable		$ 8,000,000