Business Acquisition (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	May 01, 2012
Health Plus [Member]
Business Acquisition [Line Items]
Effective date of Health Plus acquisition	May 1, 2012
Purchase price of operating assets and contract rights of Health Plus		$ 85.2
Medicaid and Medicare Service Contracts [Member]
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life (in months)	115
Trade Name [Member]
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life (in months)	120
Provider Network [Member]
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life (in months)	120