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Description of Business (Details)
Dec. 31, 2014
Customers
Description of Business [Line Items]  
Number of customers 6,000,000hnt_NumberOfCustomers
Government Contracts [Member]  
Description of Business [Line Items]  
Number of customers 2,800,000hnt_NumberOfCustomers
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_GovernmentContractsMember
Government Contracts [Member] | U.S.Department of Veterans Affairs [Member]  
Description of Business [Line Items]  
Number of customers 3,696hnt_NumberOfCustomers
/ hnt_HealthCareOrganizationsAxis
= hnt_U.S.DepartmentofVeteransAffairsMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_GovernmentContractsMember
Number of states in which entity operates 1us-gaap_NumberOfStatesInWhichEntityOperates
/ hnt_HealthCareOrganizationsAxis
= hnt_U.S.DepartmentofVeteransAffairsMember
/ us-gaap_StatementBusinessSegmentsAxis
= hnt_GovernmentContractsMember