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Segment Information (Premium Revenue By Line Of Business) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Health plans services premiums $ 3,720,800us-gaap_HealthCareOrganizationPremiumRevenue $ 2,881,345us-gaap_HealthCareOrganizationPremiumRevenue
Commercial Premium Revenue [Member]    
Segment Reporting Information [Line Items]    
Health plans services premiums 1,333,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_CommercialPremiumRevenueMember		 1,264,200us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_CommercialPremiumRevenueMember
Medicare Premium Revenue [Member]    
Segment Reporting Information [Line Items]    
Health plans services premiums 768,900us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicarePremiumRevenueMember		 755,200us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicarePremiumRevenueMember
Medicaid Premium Revenue [Member]    
Segment Reporting Information [Line Items]    
Health plans services premiums 1,471,300us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember		 862,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
Dual eligibles premium revenue [Member]    
Segment Reporting Information [Line Items]    
Health plans services premiums $ 147,600us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_DualeligiblespremiumrevenueMember		 $ 0us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_DualeligiblespremiumrevenueMember