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Summary of Significant Accounting Policies (Medicare Part D) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Reimbursed amount of catastrophic reinsurance subsidy 80.00%hnt_ReimbursedAmountOfCatastrophicReinsuranceSubsidy    
Catastrophic reinsurance subsidy $ 4,550hnt_OutOfPocketCatastrophicThreshold $ 4,750hnt_OutOfPocketCatastrophicThreshold $ 4,700hnt_OutOfPocketCatastrophicThreshold
Medicare coverage gap discount on brand name drugs 50.00%hnt_MedicareCoverageGapDiscountonBrandNameDrugs    
Premiums subject to risk corridor provisions variance 5.00%hnt_PremiumsSubjectToRiskCorridorProvisionsVariance