XML 69 R53.htm IDEA: XBRL DOCUMENT
v3.19.1

Employee Benefit Plans (Details 3) - Pension Plan | 12 Months Ended
--- | ---
Dec. 31, 2018
Employee benefits plans |
Period of operating history and sufficient trading volume of invested entity (minimum) | 5 years
Minimum |
Employee benefits plans |
Period to meet policy goals | 3 years
Maximum |
Employee benefits plans |
Period to meet policy goals | 5 years
Domestic Equities |
Employee benefits plans |
Target (as a percent) | 50.00%
Domestic Equities | Minimum |
Employee benefits plans |
Target (as a percent) | 35.00%
Domestic Equities | Maximum |
Employee benefits plans |
Target (as a percent) | 75.00%
Large Cap Growth |
Employee benefits plans |
Target (as a percent) | 22.50%
Large Cap Growth | Minimum |
Employee benefits plans |
Target (as a percent) | 15.00%
Large Cap Growth | Maximum |
Employee benefits plans |
Target (as a percent) | 30.00%
Large Cap Value |
Employee benefits plans |
Target (as a percent) | 22.50%
Large Cap Value | Minimum |
Employee benefits plans |
Target (as a percent) | 15.00%
Large Cap Value | Maximum |
Employee benefits plans |
Target (as a percent) | 30.00%
Mid Cap Value |
Employee benefits plans |
Target (as a percent) | 5.00%
Mid Cap Value | Minimum |
Employee benefits plans |
Target (as a percent) | 5.00%
Mid Cap Value | Maximum |
Employee benefits plans |
Target (as a percent) | 15.00%
Mid Cap Growth |
Employee benefits plans |
Target (as a percent) | 0.00%
Mid Cap Growth | Minimum |
Employee benefits plans |
Target (as a percent) | 0.00%
Mid Cap Growth | Maximum |
Employee benefits plans |
Target (as a percent) | 10.00%
Domestic Fixed Income |
Employee benefits plans |
Target (as a percent) | 35.00%
Domestic Fixed Income | Minimum |
Employee benefits plans |
Target (as a percent) | 15.00%
Domestic Fixed Income | Maximum |
Employee benefits plans |
Target (as a percent) | 50.00%
International Equities |
Employee benefits plans |
Target (as a percent) | 15.00%
International Equities | Minimum |
Employee benefits plans |
Target (as a percent) | 10.00%
International Equities | Maximum |
Employee benefits plans |
Target (as a percent) | 25.00%

X
- Definition Represents the period of operating history and sufficient trading volume of invested entity. + References No definition available. + Details
Name: | hhs_DefinedBenefitPlanPeriodOfOperatingHistoryAndSufficientTradingVolumeOfInvestedEntity
Namespace Prefix: | hhs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the defined benefit plan period required to meet investment policy's goal. + References No definition available. + Details
Name: | hhs_DefinedBenefitPlanPeriodToMeetGoals
Namespace Prefix: | hhs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hhs_DefinedBenefitPlanEquitySecuritiesUSLargeCapGrowthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hhs_DefinedBenefitPlanEquitySecuritiesUSLargeCapValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hhs_DefinedBenefitPlanEquitySecuritiesUSMidCapValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hhs_DefinedBenefitPlanEquitySecuritiesUSMidCapGrowthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesNonUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |