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Significant Accounting Policies (Health Plan Services Revenue Recognition) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Jan. 01, 2013
Health Care Organizations [Line Items]        
Accounts payable and other liabilities $ 1,180,454,000us-gaap_AccountsPayableOtherCurrent   $ 880,374,000us-gaap_AccountsPayableOtherCurrent  
Other noncurrent liabilities 290,714,000us-gaap_OtherLiabilitiesNoncurrent   242,705,000us-gaap_OtherLiabilitiesNoncurrent  
Other noncurrent assets 288,954,000us-gaap_OtherAssetsNoncurrent   187,630,000us-gaap_OtherAssetsNoncurrent  
Health plan services premiums 3,720,800,000us-gaap_HealthCareOrganizationPremiumRevenue 2,881,345,000us-gaap_HealthCareOrganizationPremiumRevenue    
Commercial Premium Revenue [Member]        
Health Care Organizations [Line Items]        
Health plan services premiums 1,333,000,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_CommercialPremiumRevenueMember
1,264,200,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_CommercialPremiumRevenueMember
   
Medicare Premium Revenue [Member]        
Health Care Organizations [Line Items]        
Health plan services premiums 768,900,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicarePremiumRevenueMember
755,200,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicarePremiumRevenueMember
   
Medicaid Premium Revenue [Member]        
Health Care Organizations [Line Items]        
Health plan services premiums 1,471,300,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
862,000,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
   
Settlement account balance, beginning       0hnt_SettlementAccountBalanceBeginning
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
Settlement account payment, maximum 264,000,000hnt_SettlementAccountPaymentMaximum
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
     
State Settlement Account Surplus 83,800,000hnt_StateSettlementAccountSurplus
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
  53,400,000hnt_StateSettlementAccountSurplus
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
 
Medicare Risk adjustment [Member] | Medicare Premium Revenue [Member]        
Health Care Organizations [Line Items]        
Health plan services premiums (5,400,000)us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_MedicareRiskadjustmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicarePremiumRevenueMember
15,600,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_MedicareRiskadjustmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicarePremiumRevenueMember
   
Medicaid Retro Premium Adjustment [Member] | Medicaid Premium Revenue [Member]        
Health Care Organizations [Line Items]        
Health plan services premiums 27,200,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_MedicaidRetroPremiumAdjustmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
     
State-sponsored health plans settlement account deficit [Member] | Medicaid Premium Revenue [Member]        
Health Care Organizations [Line Items]        
Other noncurrent liabilities 0us-gaap_OtherLiabilitiesNoncurrent
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_StateSponsoredHealthPlansSettlementAccountDeficitMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
     
Other noncurrent assets 0us-gaap_OtherAssetsNoncurrent
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_StateSponsoredHealthPlansSettlementAccountDeficitMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
  0us-gaap_OtherAssetsNoncurrent
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_StateSponsoredHealthPlansSettlementAccountDeficitMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
 
Health plan services premiums   (12,900,000)us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_StateSponsoredHealthPlansSettlementAccountDeficitMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
   
Minimum [Member] | Medicaid Premium Revenue [Member]        
Health Care Organizations [Line Items]        
MLR Rebate Threshold 85.00%hnt_MLRRebateThreshold
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
     
Maximum [Member] | Medicaid Premium Revenue [Member]        
Health Care Organizations [Line Items]        
MLR Rebate Threshold 95.00%hnt_MLRRebateThreshold
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
     
MLR Rebate, Premium Refund [Member] | Commercial Premium Revenue [Member]        
Health Care Organizations [Line Items]        
Health plan services premiums 0us-gaap_HealthCareOrganizationPremiumRevenue
/ hnt_HealthCareOrganizationsAxis
= hnt_MLRRebatePremiumRefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_CommercialPremiumRevenueMember
0us-gaap_HealthCareOrganizationPremiumRevenue
/ hnt_HealthCareOrganizationsAxis
= hnt_MLRRebatePremiumRefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_CommercialPremiumRevenueMember
   
MLR Rebate, Premium Refund [Member] | Medicaid Premium Revenue [Member]        
Health Care Organizations [Line Items]        
Accounts payable and other liabilities 264,000,000us-gaap_AccountsPayableOtherCurrent
/ hnt_HealthCareOrganizationsAxis
= hnt_MLRRebatePremiumRefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
  200,600,000us-gaap_AccountsPayableOtherCurrent
/ hnt_HealthCareOrganizationsAxis
= hnt_MLRRebatePremiumRefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
 
Health plan services premiums (63,400,000)us-gaap_HealthCareOrganizationPremiumRevenue
/ hnt_HealthCareOrganizationsAxis
= hnt_MLRRebatePremiumRefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
0us-gaap_HealthCareOrganizationPremiumRevenue
/ hnt_HealthCareOrganizationsAxis
= hnt_MLRRebatePremiumRefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
   
Profit sharing, premium refund [Member] | Medicaid Premium Revenue [Member]        
Health Care Organizations [Line Items]        
Accounts payable and other liabilities 12,900,000us-gaap_AccountsPayableOtherCurrent
/ hnt_HealthCareOrganizationsAxis
= hnt_ProfitsharingpremiumrefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
  27,000,000us-gaap_AccountsPayableOtherCurrent
/ hnt_HealthCareOrganizationsAxis
= hnt_ProfitsharingpremiumrefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
 
Other noncurrent liabilities 3,800,000us-gaap_OtherLiabilitiesNoncurrent
/ hnt_HealthCareOrganizationsAxis
= hnt_ProfitsharingpremiumrefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
  0us-gaap_OtherLiabilitiesNoncurrent
/ hnt_HealthCareOrganizationsAxis
= hnt_ProfitsharingpremiumrefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
 
Profit Corridor Payment 23,800,000hnt_ProfitCorridorPayment
/ hnt_HealthCareOrganizationsAxis
= hnt_ProfitsharingpremiumrefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
     
Other noncurrent assets 0us-gaap_OtherAssetsNoncurrent
/ hnt_HealthCareOrganizationsAxis
= hnt_ProfitsharingpremiumrefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
  2,300,000us-gaap_OtherAssetsNoncurrent
/ hnt_HealthCareOrganizationsAxis
= hnt_ProfitsharingpremiumrefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
 
Health plan services premiums $ (15,800,000)us-gaap_HealthCareOrganizationPremiumRevenue
/ hnt_HealthCareOrganizationsAxis
= hnt_ProfitsharingpremiumrefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
$ (1,400,000)us-gaap_HealthCareOrganizationPremiumRevenue
/ hnt_HealthCareOrganizationsAxis
= hnt_ProfitsharingpremiumrefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember