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Legal Proceedings (Details) (Litigation Related to Military Family Life Consultants [Member])
Mar. 31, 2015
actions
Jun. 14, 2011
actions
Litigation Related to Military Family Life Consultants [Member]
    
Commitments and Contingencies [Line Items]    
Number of pending litigations 3hnt_NumberOfPendingLitigations
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hnt_LitigationRelatedtoMilitaryFamilyLifeConsultantsMember		  
Number of former MFLCs filing putative class action 2hnt_NumberofformerMFLCsfilingputativeclassaction
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hnt_LitigationRelatedtoMilitaryFamilyLifeConsultantsMember		 2hnt_NumberofformerMFLCsfilingputativeclassaction
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hnt_LitigationRelatedtoMilitaryFamilyLifeConsultantsMember
Number of other named plaintiffs 12hnt_Numberofothernamedplaintiffs
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hnt_LitigationRelatedtoMilitaryFamilyLifeConsultantsMember