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Long-Term Equity Compensation (Summary of Restricted Stock Units and Performance Stock Units) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Outstanding beginning balance, Number of Restricted Stock Units and Performance Share Units 1,838,772us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Granted, Number of Restricted Stock Units and Performance Share Units 881,338us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Vested, Number of Restricted Stock Units and Performance Share Units (907,072)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Forfeited, Number of Restricted Stock Units and Performance Share Units (88,743)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Outstanding ending balance, Number of Restricted Stock Units and Performance Share Units 1,724,295us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Outstanding beginning balance, Weighted Average Grant-Date Fair Value $ 29.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Granted, Weighted Average Grant-Date Fair Value $ 32.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Vested,Weighted Average Grant-Date Fair Value $ 29.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Forfeited, Weighted Average Grant-Date Fair Value $ 30.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Outstanding ending balance, Weighted Average Grant-Date Fair Value $ 30.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Outstanding beginning balance, Weighted Average Purchase Price $ 0.000hnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAveragePurchasePrice
Granted, Weighted Average Purchase Price $ 0.000hnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAveragePurchasePrice
Vested, Weighted Average Purchase Price $ 0.000hnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAveragePurchasePrice
Forfeited, Weighted Average Purchase Price $ 0.000hnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAveragePurchasePrice
Outstanding ending balance, Weighted Average Purchase Price $ 0.000hnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAveragePurchasePrice
Outstanding, Weighted Average Remaining Contractual Term (Years) 10 months 13 days
Outstanding, Aggregated Intrinsic Value $ 92,301,511us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
Expected to vest, Number of Restricted Stock Units and Performance Share Units 1,649,410hnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExpectedToVestOutstandingNumber
Expected to vest, Weighted Average Grant-Date Fair Value $ 30.84hnt_SharebasedCompensationArrangementbySharebasedPaymentAwardOtherthanOptionsExpectedtoVestOutstandingWeightedAverageExercisePrice
Expected to vest, Weighted Average Purchase Price $ 0.000hnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherIncomeOptionsExpectedToVestExercisableWeightedAveragePurchasePrice
Expected to vest, Weighted Average Remaining Contractual Term (Years) 10 months 28 days
Expected to vest, Aggregate Intrinsic Value $ 88,292,899hnt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExpectedToVestExercisableAggregateIntrinsicValue