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Consolidated Statements of Comprehesive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]                      
Net income $ 4,900us-gaap_NetIncomeLoss [1],[2] $ (8,900)us-gaap_NetIncomeLoss [3],[4] $ 120,900us-gaap_NetIncomeLoss [5],[6] $ 28,800us-gaap_NetIncomeLoss $ 19,800us-gaap_NetIncomeLoss $ 66,800us-gaap_NetIncomeLoss [7] $ 33,500us-gaap_NetIncomeLoss [8] $ 50,100us-gaap_NetIncomeLoss [9] $ 145,629us-gaap_NetIncomeLoss $ 170,126us-gaap_NetIncomeLoss $ 122,063us-gaap_NetIncomeLoss
Unrealized gains (losses) on investments available-for-sale:                      
Unrealized holding gains (losses) arising during the period                 59,073us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax (78,217)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax 65,462us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Less: Reclassification adjustments for gains included in earnings                 (2,710)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax (23,975)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax (36,680)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Unrealized gains (losses) on investments available-for-sale, net                 56,363us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax (102,192)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax 28,782us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Defined benefit pension plans:                      
Prior service cost arising during the period                 0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax 607us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax 0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax
Net (loss) gain arising during the period                 (11,893)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax 7,294us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax (646)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Less: Amortization of prior service cost and net loss included in net periodic pension cost                 600hnt_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostAndNetLossRecognizedInNetPeriodicBenefitCostBeforeTax 2,572hnt_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostAndNetLossRecognizedInNetPeriodicBenefitCostBeforeTax 4,152hnt_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostAndNetLossRecognizedInNetPeriodicBenefitCostBeforeTax
Defined benefit pension plans, net                 11,293us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax (10,473)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax (3,506)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Other comprehensive income (loss), before tax                 45,070us-gaap_OtherComprehensiveIncomeLossBeforeTax (91,719)us-gaap_OtherComprehensiveIncomeLossBeforeTax 32,288us-gaap_OtherComprehensiveIncomeLossBeforeTax
Income tax expense (benefit) related to components of other comprehensive income                 15,464us-gaap_OtherComprehensiveIncomeLossTax (31,868)us-gaap_OtherComprehensiveIncomeLossTax 21,936us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive income (loss), net of tax                 29,606us-gaap_OtherComprehensiveIncomeLossNetOfTax (59,851)us-gaap_OtherComprehensiveIncomeLossNetOfTax 10,352us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income                 $ 175,235us-gaap_ComprehensiveIncomeNetOfTax $ 110,275us-gaap_ComprehensiveIncomeNetOfTax $ 132,415us-gaap_ComprehensiveIncomeNetOfTax
[1] Includes $3.8 million pretax asset impairment primarily related to our assets held for sale in connection with the Cognizant Transaction and $68.3 million in pretax expenses primarily related to the Cognizant Transaction.
[2] ncludes $35.4 million amortization of deferred costs of health insurer's fee and $25.8 million in other ACA fees.
[3] Includes $31.9 million amortization of deferred costs of health insurer's fee and $26.6 million in other ACA fees.
[4] Includes $84.7 million pretax asset impairment related to our assets held for sale in connection with the Cognizant Transaction and $21.1 million in pretax expenses primarily related to the Cognizant transaction.
[5] Includes tax benefit of $72.6 million, net of adjustments, as a result of a loss on the stock of one of our subsidiaries.
[6] Includes $37.8 million amortization of deferred costs of health insurer's fee and $22.5 million in other ACA fees.
[7] Includes $32.1 million of Medicaid premium revenue as a result of Medicaid/Medi-Cal retroactive rate adjustments for periods prior to 2013.
[8] Includes a $12.9 million in pretax costs related to continuing efforts to address scale issues.
[9] Includes $42.2 million of Medicaid premium revenue as a result of Medicaid/Medi-Cal retroactive rate adjustments related to 2011 and 2012.