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Significant Accounting Policies (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill and intangible assets
Annual goodwill impairment testing date	November 30
Insurance
Deductible for individual healthcare claims	$ 0.3
Deductible for general liability claims	0.3
Deductible for workers' compensation	0.5
Self insurance reserve	$ 3.5	$ 4.6

X

- Definition

Annual goodwill impairment testing date

+ References

No definition available.

+ Details

Name:	hhs_AnnualGoodwillImpairmentTestingDate
Namespace Prefix:	hhs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount deductible during the period for individual healthcare claims.

+ References

No definition available.

+ Details

Name:	hhs_DeductibleForIndividualHealthCareClaims
Namespace Prefix:	hhs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount deductible during the period for workers' compensation.

+ References

No definition available.

+ Details

Name:	hhs_DeductibleForWorkersCompensation
Namespace Prefix:	hhs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount deductible during the period for general liability claims.

+ References

No definition available.

+ Details

Name:	hhs_DeductibleforGeneralLiabilityClaims
Namespace Prefix:	hhs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_InsuranceAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_SelfInsuranceReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant