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Long-Term Debt (Details 4) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Future minimum principal payments      
2015 $ 18,375,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths    
2016 64,312,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo    
Total debt 82,687,000us-gaap_LongTermDebt 98,000,000us-gaap_LongTermDebt  
Cash payments for interest 2,500,000us-gaap_InterestPaid 2,800,000us-gaap_InterestPaid 3,200,000us-gaap_InterestPaid
Minimum      
Long-term debt obligation      
Interest coverage ratio (as a percent) 2.75hhs_DebtInstrumentCovenantConsolidatedInterestCoverageRatio
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum      
Long-term debt obligation      
Aggregate percentage limit of consolidated revenue accounted for by foreign subsidiaries 25.00%hhs_DebtInstrumentCovenantAggregatePercentageLimitOfRevenueAccountedForByForeignSubsidiaries
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Aggregate percentage limit of assets accounted for by foreign subsidiaries 20.00%hhs_DebtInstrumentCovenantAggregatePercentageLimitOfAssetsAccountedForByForeignSubsidiaries
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Limit of allowed indebtedness of subsidiaries 20,000,000hhs_DebtInstrumentCovenantIndebtednessOfSubsidiaries
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
2013 Revolving Credit Facility, due August 16, 2016 | Maximum      
Long-term debt obligation      
Debt-to-EBITDA ratio (as a percent) 2.25hhs_DebtInstrumentCovenantDebtToEarningsBeforeInterestTaxDepreciationAndAmortizationRatio
/ us-gaap_CreditFacilityAxis
= hhs_RevolvingCreditFacility2013Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
2011 Term Loan Facility, due August 16, 2016      
Future minimum principal payments      
Total debt $ 82,687,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= hhs_TwoZeroOneOneTermLoanFacilityMember
$ 98,000,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= hhs_TwoZeroOneOneTermLoanFacilityMember
 
2011 Term Loan Facility, due August 16, 2016 | Maximum      
Long-term debt obligation      
Debt-to-EBITDA ratio (as a percent) 3.00hhs_DebtInstrumentCovenantDebtToEarningsBeforeInterestTaxDepreciationAndAmortizationRatio
/ us-gaap_CreditFacilityAxis
= hhs_TwoZeroOneOneTermLoanFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember