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Income Taxes - Income Tax Assets and Liabilities Included in Other Assets and Other Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Income tax (asset) liability |  |
Current | $ (16,266) | $ (3,832)
Deferred | $ 157,775 | $ 205,699

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- Definition Current income tax assets liabilities. + References No definition available. + Details
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Namespace Prefix: | hnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Deferred income tax assets liabilities. + References No definition available. + Details
Name: | hnm_DeferredIncomeTaxLiabilitiesAssets
Namespace Prefix: | hnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | hnm_IncomeTaxAssetLiabilityAbstract
Namespace Prefix: | hnm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration