Summary of Significant Accounting Policies (Details 6) (USD $)	12 Months Ended		12 Months Ended				12 Months Ended		12 Months Ended		12 Months Ended			1 Months Ended	12 Months Ended		12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2011 Managed Behavioral Healthcare	Dec. 31, 2011 Commercial	Dec. 31, 2010 Commercial	Dec. 31, 2009 Commercial	Dec. 31, 2011 Radiology Benefits Management	Dec. 31, 2009 Radiology Benefits Management	Dec. 31, 2011 Specialty Pharmaceutical Management	Dec. 31, 2009 Specialty Pharmaceutical Management	Dec. 31, 2011 Specialty Pharmaceutical Management Discounted cash flow	Dec. 31, 2011 Specialty Pharmaceutical Management Merger and acquisition	Dec. 31, 2011 Specialty Pharmaceutical Management Public company	Oct. 31, 2011 Medicaid Administration	Dec. 31, 2011 Medicaid Administration	Dec. 31, 2009 Medicaid Administration	Dec. 31, 2011 Medicaid Administration Discounted cash flow	Dec. 31, 2011 Medicaid Administration Merger and acquisition	Dec. 31, 2011 Medicaid Administration Public company
Goodwill
Weights applied to determine fair value of goodwill (as a percent)											60.00%	24.00%	16.00%				75.00%	22.50%	2.50%
Percentage change in fair value of goodwill			56.00%				54.00%		20.00%					8.00%
Change in fair value of goodwill														$ 10,000,000
Increase in discount rate to calculate fair value (as a percent)															0.85%
Decrease percentage of estimated future cash flows, low end of range (as a percent)															12.00%
Decrease percentage of estimated future cash flows, high end of range (as a percent)															25.00%
Changes in goodwill
Balance as of beginning of period	426,471,000	426,939,000		120,485,000	120,485,000	120,485,000	104,549,000	104,549,000	142,291,000	142,291,000					59,614,000	59,146,000
Acquisition of Medicaid Administration	468,000
Balance as of end of period	$ 426,939,000	$ 426,939,000		$ 120,485,000	$ 120,485,000	$ 120,485,000	$ 104,549,000	$ 104,549,000	$ 142,291,000	$ 142,291,000					$ 59,614,000	$ 59,146,000