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Significant Accounting Policies (Details) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended
Jun. 30, 2014
item
Dec. 31, 2014
segment
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Jun. 30, 2012
Changes in the allowance for doubtful accounts            
Balance at beginning of year   $ 1,729,000us-gaap_AllowanceForDoubtfulAccountsReceivable $ 2,574,000us-gaap_AllowanceForDoubtfulAccountsReceivable $ 2,445,000us-gaap_AllowanceForDoubtfulAccountsReceivable    
Net charges to expense   (68,000)us-gaap_ProvisionForDoubtfulAccounts 47,000us-gaap_ProvisionForDoubtfulAccounts 722,000us-gaap_ProvisionForDoubtfulAccounts    
Amounts recovered against the allowance, net of charges   (437,000)us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries (892,000)us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries (593,000)us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries    
Balance at end of year   1,224,000us-gaap_AllowanceForDoubtfulAccountsReceivable 1,729,000us-gaap_AllowanceForDoubtfulAccountsReceivable 2,574,000us-gaap_AllowanceForDoubtfulAccountsReceivable    
Property, plant and equipment            
Equipment and furniture   210,612,000us-gaap_PropertyPlantAndEquipmentGross 210,565,000us-gaap_PropertyPlantAndEquipmentGross      
Less accumulated amortization   (173,699,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (169,854,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment      
Net property, plant and equipment   36,913,000us-gaap_PropertyPlantAndEquipmentNet 40,711,000us-gaap_PropertyPlantAndEquipmentNet      
Depreciation and amortization expense   14,894,000us-gaap_Depreciation 15,530,000us-gaap_Depreciation 15,676,000us-gaap_Depreciation    
Goodwill and Other Intangibles            
Number of reportable segments 2us-gaap_NumberOfReportableSegments 2us-gaap_NumberOfReportableSegments        
Reserve for Healthcare, Workers' Compensation, Automobile and General Liability            
Deductible for automobile and general liability claims   300,000hhs_DeductibleForAutomobileAndGeneralLiabilityClaims        
Reserve for healthcare, workers' compensation, net, automobile and general liability   7,800,000us-gaap_SelfInsuranceReserve 9,400,000us-gaap_SelfInsuranceReserve      
Deductible for individual healthcare claims   300,000hhs_DeductibleForIndividualHealthCareClaims        
Deductible for workers' compensation   500,000hhs_DeductibleForWorkersCompensation        
Customer Interaction            
Goodwill and Other Intangibles            
Impairment charges related to trade names and client relationships     2,800,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hhs_CustomerInteractionsMember
  2,800,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hhs_CustomerInteractionsMember
 
Shoppers            
Goodwill and Other Intangibles            
Impairment charges related to goodwill           156,900,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hhs_ShoppersMember
Impairment charges related to trade names and client relationships           8,400,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hhs_ShoppersMember
Total impairment charges           165,300,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= hhs_ShoppersMember
Building and building improvements | Minimum            
Property, plant and equipment            
Estimated useful lives   10 years        
Building and building improvements | Maximum            
Property, plant and equipment            
Estimated useful lives   40 years        
Software | Minimum            
Property, plant and equipment            
Estimated useful lives   3 years        
Software | Maximum            
Property, plant and equipment            
Estimated useful lives   10 years        
Equipment and furniture | Minimum            
Property, plant and equipment            
Estimated useful lives   3 years        
Equipment and furniture | Maximum            
Property, plant and equipment            
Estimated useful lives   20 years        
Equipment and furniture - capital lease            
Property, plant and equipment            
Equipment and furniture   1,351,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hhs_EquipmentAndFurnitureCapitalLeaseMember
2,323,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hhs_EquipmentAndFurnitureCapitalLeaseMember
     
Less accumulated amortization   (980,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hhs_EquipmentAndFurnitureCapitalLeaseMember
(1,535,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hhs_EquipmentAndFurnitureCapitalLeaseMember
     
Net property, plant and equipment   371,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hhs_EquipmentAndFurnitureCapitalLeaseMember
788,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hhs_EquipmentAndFurnitureCapitalLeaseMember
     
Depreciation and amortization expense   200,000us-gaap_Depreciation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hhs_EquipmentAndFurnitureCapitalLeaseMember
300,000us-gaap_Depreciation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hhs_EquipmentAndFurnitureCapitalLeaseMember
500,000us-gaap_Depreciation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hhs_EquipmentAndFurnitureCapitalLeaseMember
   
Property, plant and equipment except assets under capital leases            
Property, plant and equipment            
Depreciation and amortization expense   $ 14,700,000us-gaap_Depreciation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hhs_PropertyPlantAndEquipmentExceptAssetsUnderCapitalLeasesMember
$ 15,400,000us-gaap_Depreciation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hhs_PropertyPlantAndEquipmentExceptAssetsUnderCapitalLeasesMember
$ 15,400,000us-gaap_Depreciation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hhs_PropertyPlantAndEquipmentExceptAssetsUnderCapitalLeasesMember