Summary of Significant Accounting Policies (Details 6) (USD $) In Thousands, unless otherwise specified				12 Months Ended		12 Months Ended				12 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Partners Rx	Oct. 02, 2013 Partners Rx	Dec. 31, 2013 AlphaCare Holdings Inc.	Sep. 30, 2013 Health Plan	Dec. 31, 2013 Health Plan	Dec. 31, 2012 Health Plan	Sep. 30, 2013 Specialty Solutions	Dec. 31, 2013 Specialty Solutions	Dec. 31, 2012 Specialty Solutions	Sep. 30, 2013 Pharmacy Management	Dec. 31, 2013 Pharmacy Management	Dec. 31, 2012 Pharmacy Management	Sep. 30, 2013 Pharmacy Management Discounted cash flow	Sep. 30, 2013 Pharmacy Management Merger and acquisition	Sep. 30, 2013 Pharmacy Management Public company	Dec. 31, 2013 Public Sector
Goodwill
Weights applied to determine fair value of goodwill (as a percent)																75.00%	22.50%	2.50%
Percentage change in fair value of goodwill							47.90%			32.90%			25.50%
Goodwill	$ 488,206	$ 426,939	$ 426,939		$ 40,385	$ 20,882		$ 120,485	$ 120,485		$ 104,549	$ 104,549		$ 242,290	$ 201,905				$ 20,882
Changes in goodwill
Balance as of beginning of period	488,206	426,939	426,939		40,385			120,485	120,485		104,549	104,549		242,290	201,905				20,882
Acquisition				40,385		20,882
Balance as of end of period	$ 488,206	$ 426,939	$ 426,939		$ 40,385	$ 20,882		$ 120,485	$ 120,485		$ 104,549	$ 104,549		$ 242,290	$ 201,905				$ 20,882