Name:	hmsy_DefinedContributionPlanEmployerContributionRequisiteServicePeriod
Namespace Prefix:	hmsy_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of first level percentage of pay contributed by each eligible employee for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	hmsy_DefinedContributionPlanEmployerMatchingContributionLevelOne
Namespace Prefix:	hmsy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of next level percentage of pay contributed by each eligible employee for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	hmsy_DefinedContributionPlanEmployerMatchingContributionLevelTwo
Namespace Prefix:	hmsy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the first percentage of pay contributed by each eligible employee as level one for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	hmsy_DefinedContributionPlanEmployerMatchingContributionPercentLevelOne
Namespace Prefix:	hmsy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the next percentage of pay contributed by each eligible employee as level two for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	hmsy_DefinedContributionPlanEmployerMatchingContributionPercentLevelTwo
Namespace Prefix:	hmsy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents participants' voluntary contribution to the 401 (k) Plan, as a percentage of their annual base pre-tax compensation which should not exceed the federally determined contribution.

No definition available.

Name:	hmsy_DefinedContributionPlanParticipantsMaximumContributionPercentageOfAnnualBasePretaxCompensation
Namespace Prefix:	hmsy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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

The amount of the cost recognized during the period for defined contribution plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.