XML 113 R40.htm IDEA: XBRL DOCUMENT v2.4.1.9
Summary of Significant Accounting Policies (Health Plan Services Revenue Recognition) (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Mar. 31, 2013
Health Care Organizations [Line Items]          
Accounts payable and other liabilities $ 880,374,000us-gaap_AccountsPayableOtherCurrent $ 397,036,000us-gaap_AccountsPayableOtherCurrent      
Health plan services premiums 13,361,170,000us-gaap_HealthCareOrganizationPremiumRevenue 10,377,073,000us-gaap_HealthCareOrganizationPremiumRevenue 10,459,098,000us-gaap_HealthCareOrganizationPremiumRevenue    
Other noncurrent assets 187,630,000us-gaap_OtherAssetsNoncurrent 162,551,000us-gaap_OtherAssetsNoncurrent      
Medicare, Medicaid and Dual Eligibles [Member]          
Health Care Organizations [Line Items]          
Percentage of health plan services premiums generated under contract 59.00%hnt_HealthCareOrganizationPercentageOfPremiumRevenue
/ hnt_HealthCareOrganizationsAxis
= hnt_MedicareMedicaidandDualEligiblesMember
       
Medicare and Medicaid/Medi-Cal [Member]          
Health Care Organizations [Line Items]          
Percentage of health plan services premiums generated under contract   50.00%hnt_HealthCareOrganizationPercentageOfPremiumRevenue
/ hnt_HealthCareOrganizationsAxis
= hnt_MedicareAndMedicaidMediCalMember
45.00%hnt_HealthCareOrganizationPercentageOfPremiumRevenue
/ hnt_HealthCareOrganizationsAxis
= hnt_MedicareAndMedicaidMediCalMember
   
Commercial Premium Revenue [Member]          
Health Care Organizations [Line Items]          
Health plan services premiums 5,443,100,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_CommercialPremiumRevenueMember
5,175,400,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_CommercialPremiumRevenueMember
5,705,500,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_CommercialPremiumRevenueMember
   
Commercial Premium Revenue [Member] | MLR Rebate, Premium Refund [Member]          
Health Care Organizations [Line Items]          
Health plan services premiums 0us-gaap_HealthCareOrganizationPremiumRevenue
/ hnt_HealthCareOrganizationsAxis
= hnt_MLRRebatePremiumRefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_CommercialPremiumRevenueMember
       
Medicaid Premium Revenue [Member]          
Health Care Organizations [Line Items]          
Health plan services premiums 4,755,900,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
2,430,300,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
1,963,100,000us-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 53,400,000hnt_StateSettlementAccountSurplus
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
       
Settlement account receivable 0hnt_SettlementAccountReceivable
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
       
Settlement account payable 0hnt_SettlementAccountPayable
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
       
Medicaid Premium Revenue [Member] | Profit sharing, premium refund [Member]          
Health Care Organizations [Line Items]          
Accounts payable and other liabilities 27,000,000us-gaap_AccountsPayableOtherCurrent
/ hnt_HealthCareOrganizationsAxis
= hnt_ProfitsharingpremiumrefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
       
Health plan services premiums (24,700,000)us-gaap_HealthCareOrganizationPremiumRevenue
/ hnt_HealthCareOrganizationsAxis
= hnt_ProfitsharingpremiumrefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
       
Other noncurrent assets 2,300,000us-gaap_OtherAssetsNoncurrent
/ hnt_HealthCareOrganizationsAxis
= hnt_ProfitsharingpremiumrefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
       
Medicaid Premium Revenue [Member] | MLR Rebate, Premium Refund [Member]          
Health Care Organizations [Line Items]          
Accounts payable and other liabilities 200,600,000us-gaap_AccountsPayableOtherCurrent
/ hnt_HealthCareOrganizationsAxis
= hnt_MLRRebatePremiumRefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
       
Health plan services premiums (200,600,000)us-gaap_HealthCareOrganizationPremiumRevenue
/ hnt_HealthCareOrganizationsAxis
= hnt_MLRRebatePremiumRefundMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
       
Medicare Premium Revenue [Member]          
Health Care Organizations [Line Items]          
Health plan services premiums 3,044,300,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicarePremiumRevenueMember
2,771,400,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicarePremiumRevenueMember
2,790,500,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicarePremiumRevenueMember
   
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
       
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
       
Medicare Risk adjustment [Member] | Medicare Premium Revenue [Member]          
Health Care Organizations [Line Items]          
Health plan services premiums 13,100,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_MedicareRiskadjustmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicarePremiumRevenueMember
(9,000,000)us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_MedicareRiskadjustmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicarePremiumRevenueMember
12,000,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_MedicareRiskadjustmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicarePremiumRevenueMember
   
Medicaid Retro Rate Adjustment [Member] | Medicaid Premium Revenue [Member]          
Health Care Organizations [Line Items]          
Health plan services premiums   74,300,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_MedicaidRetroRateAdjustmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
21,700,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_MedicaidRetroRateAdjustmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
32,100,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_MedicaidRetroRateAdjustmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
42,200,000us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_MedicaidRetroRateAdjustmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
State Sponsored Health Plans Settlement Account Deficit [Member] | Medicaid Premium Revenue [Member]          
Health Care Organizations [Line Items]          
Health plan services premiums (62,900,000)us-gaap_HealthCareOrganizationPremiumRevenue
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_StateSponsoredHealthPlansSettlementAccountDeficitMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
62,900,000us-gaap_HealthCareOrganizationPremiumRevenue
/ 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
62,900,000us-gaap_OtherAssetsNoncurrent
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_StateSponsoredHealthPlansSettlementAccountDeficitMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember
     
Receivable with imputed interest, discount   $ 4,400,000us-gaap_ReceivableWithImputedInterestDiscount
/ us-gaap_HealthCareOrganizationRevenueSourcesAxis
= hnt_StateSponsoredHealthPlansSettlementAccountDeficitMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_MedicaidPremiumRevenueMember