General (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2012 contract Y	Mar. 31, 2011
Net revenues
Managed Care Revenue	$ 601,800,000	$ 550,000,000
Fee-For-Service and Cost-Plus Contracts Revenue	36,000,000	42,400,000
Block Grant Revenues	28,900,000	26,200,000
Dispensing Revenue	87,200,000	60,400,000
Performance-Based Revenue	8,000,000	3,100,000
Rebate revenues	9,700,000	6,800,000
Significant customers
Revenues generated	773,213,000	692,755,000
Number of contract extensions available under option	2
Contract extension period available under option (in years)	1
Minimum number of contracts per customer	1
Maricopa County Regional Behavioral Health Authority
Significant customers
Revenues generated	193,100,000	191,000,000
Number of members receiving behavioral healthcare management and other related services	715,000
Termination notice (in days)	10
Commercial
Significant customers
Revenues generated	180,524,000	150,035,000
Commercial | Customer A | Service
Significant customers
Revenues generated	49,743,000	50,438,000
Commercial | Customer B | Service
Significant customers
Revenues generated	16,085,000	17,008,000
Commercial | Customer C | Service
Significant customers
Revenues generated	29,326,000	27,552,000
Commercial | Customer D | Service
Significant customers
Revenues generated	33,727,000
Public Sector
Significant customers
Revenues generated	388,888,000	350,516,000
Public Sector | Customer E | Service
Significant customers
Revenues generated	55,236,000	40,318,000
Radiology Benefits Management
Significant customers
Revenues generated	76,857,000	89,212,000
Radiology Benefits Management | Customer F | Service
Significant customers
Revenues generated	26,556,000	33,247,000
Radiology Benefits Management | Customer G | Service
Significant customers
Revenues generated		16,663,000
Radiology Benefits Management | Customer H | Service
Significant customers
Revenues generated	14,378,000	13,340,000
Radiology Benefits Management | Customer I | Service
Significant customers
Revenues generated	12,253,000	7,990,000
Radiology Benefits Management | Customer J | Service
Significant customers
Revenues generated	9,104,000	6,508,000
Specialty Pharmaceutical Management
Significant customers
Revenues generated	100,198,000	70,230,000
Specialty Pharmaceutical Management | Customer B | Service
Significant customers
Revenues generated	14,647,000	3,709,000
Specialty Pharmaceutical Management | Customer K | Service
Significant customers
Revenues generated	31,044,000	22,004,000
Specialty Pharmaceutical Management | Customer L | Service
Significant customers
Revenues generated	15,626,000	14,760,000
Medicaid Administration
Significant customers
Revenues generated	47,854,000	53,293,000
Medicaid Administration | Customer P | Service
Significant customers
Revenues generated	4,914,000	4,169,000
Medicaid Administration | Customer M | Service
Significant customers
Revenues generated		7,221,000
Medicaid Administration | Customer N | Service
Significant customers
Revenues generated	21,108,000	20,531,000
Medicaid Administration | Customer O | Service
Significant customers
Revenues generated	$ 6,803,000	$ 6,019,000