General (Details 2) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net revenues
Managed Care Revenue	$ 638,000,000	$ 544,600,000	$ 1,239,800,000	$ 1,094,600,000
Fee-For-Service and Cost-Plus Contracts Revenue	35,100,000	44,000,000	71,000,000	86,400,000
Block Grant Revenues	29,000,000	27,000,000	57,900,000	53,200,000
Dispensing Revenue	88,500,000	56,600,000	175,600,000	117,000,000
Performance-Based Revenue	3,900,000	10,200,000	11,900,000	13,200,000
Rebate revenues	9,300,000	7,800,000	19,000,000	14,700,000
Significant customers
Revenues generated	805,473,000	698,338,000	1,578,686,000	1,391,093,000
Maricopa County Regional Behavioral Health Authority
Significant customers
Revenues generated			383,200,000	383,600,000
Number of members receiving behavioral healthcare management and other related services			715,000
Termination notice (in days)			10
Commercial
Significant customers
Revenues generated	178,227,000	139,686,000	358,751,000	289,721,000
Commercial | Customer A | Service
Significant customers
Revenues generated			96,106,000	91,606,000
Commercial | Customer B | Service
Significant customers
Revenues generated			32,137,000	33,402,000
Commercial | Customer C | Service
Significant customers
Revenues generated			60,923,000	54,796,000
Minimum number of contracts per customer			1
Commercial | Customer D | Service
Significant customers
Revenues generated			67,381,000
Public Sector
Significant customers
Revenues generated	410,136,000	362,284,000	799,024,000	712,800,000
Public Sector | Customer E | Service
Significant customers
Revenues generated			111,259,000	81,060,000
Number of contract extensions available under option			2
Contract extension period available under option (in years)			1
Radiology Benefits Management
Significant customers
Revenues generated	88,826,000	90,608,000	165,683,000	179,820,000
Radiology Benefits Management | Customer F | Service
Significant customers
Revenues generated			53,405,000	67,392,000
Radiology Benefits Management | Customer G | Service
Significant customers
Revenues generated				30,934,000
Minimum number of contracts per customer			1
Radiology Benefits Management | Customer H | Service
Significant customers
Revenues generated			29,049,000	26,720,000
Radiology Benefits Management | Customer I | Service
Significant customers
Revenues generated			28,092,000	16,157,000
Radiology Benefits Management | Customer J | Service
Significant customers
Revenues generated			18,333,000	15,801,000
Specialty Pharmaceutical Management
Significant customers
Revenues generated	101,976,000	69,366,000	202,174,000	139,596,000
Specialty Pharmaceutical Management | Customer B | Service
Significant customers
Revenues generated			33,746,000	9,733,000
Minimum number of contracts per customer			1
Specialty Pharmaceutical Management | Customer K | Service
Significant customers
Revenues generated			64,651,000	42,989,000
Minimum number of contracts per customer			1
Specialty Pharmaceutical Management | Customer L | Service
Significant customers
Revenues generated			30,643,000	27,963,000
Minimum number of contracts per customer			1
Medicaid Administration
Significant customers
Revenues generated	43,026,000	56,637,000	90,880,000	109,930,000
Medicaid Administration | Customer M | Service
Significant customers
Revenues generated				13,805,000
Medicaid Administration | Customer N | Service
Significant customers
Revenues generated			37,826,000	40,774,000
Medicaid Administration | Customer O | Service
Significant customers
Revenues generated			12,880,000	12,466,000
Minimum number of contracts per customer			1
Medicaid Administration | Customer P | Service
Significant customers
Revenues generated			$ 9,879,000	$ 11,411,000
Minimum number of contracts per customer			1