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Note 6 - Estimated Liability for Appeals - Summary of Estimated Liability and Allowance for Appeals (Details) - Estimated Liability for Appeals and Estimated Allowance for Appeals [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Balance--beginning of period	$ 11,126
Provision
Appeals found in providers favor	(521)
Balance--end of period	$ 10,605

Represents deductions in a given period to allowances and reserves due to appeals found in providers favor.

+ References

No definition available.

+ Details

Name:	hmsy_ValuationAllowancesAndReservesAppealsFoundInProvidersFavor
Namespace Prefix:	hmsy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

+ Details

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

- Definition

Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses.

+ References

+ Details

Name:	us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=hmsy_EstimatedLiabilityForAppealsAndEstimatedAllowanceForAppealsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: