Related Party Transactions (Details) (USD $)				1 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Feb. 29, 2012 ThinkPets Inc [Member]	Dec. 31, 2011 ThinkPets Inc [Member]	Dec. 31, 2010 ThinkPets Inc [Member]	Dec. 31, 2009 ThinkPets Inc [Member]	Dec. 31, 2011 Akin Gump Strauss Hauer Feld [Member]	Dec. 31, 2010 Akin Gump Strauss Hauer Feld [Member]	Dec. 31, 2009 Akin Gump Strauss Hauer Feld [Member]	Dec. 31, 2011 VetSource [Member]	Dec. 31, 2010 VetSource [Member]	Dec. 31, 2009 VetSource [Member]	Apr. 08, 2010 VetSource [Member]
Related Party Transactions (Textual) [Abstract]
Percentage of ownership interest of Chief Operating Officer					8.00%
Business acquisition, total cost					$ 3,400,000	$ 2,800,000	$ 2,700,000	$ 1,600,000	$ 2,300,000	$ 1,300,000	$ 28,200,000	$ 41,900,000	$ 38,300,000
Business acquisition, common stock issued				473,389
Business acquisition, cash payment	(203,996,000)	(79,851,000)	(74,567,000)	10,500,000
Agreement term											The agreement has a five-year term and will renew for one year terms unless either party provides written notice of termination to the other party at least 120 days prior to expiration of the then current term
Related party transaction agreement period											5 years
Related party transaction agreement renewal period											1 year
Written notice period for termination of the expiration of the term											at least 120 days
Percentage of outstanding preferred stock purchased														34.00%
Amount paid to purchase outstanding preferred stock of acquired company														1,000,000
Fee received for advisory services												1,000,000
Percentage of Company acquired				100.00%
Purchase price of acquisition				$ 21,000,000