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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Intangible assets      
Intangible assets, gross $ 137,755us-gaap_FiniteLivedIntangibleAssetsGross   137,755us-gaap_FiniteLivedIntangibleAssetsGross
Less: Accumulated amortization (68,254)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   (63,177)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, net 69,501us-gaap_FiniteLivedIntangibleAssetsNet   74,578us-gaap_FiniteLivedIntangibleAssetsNet
Amortization of intangibles      
Remainder of 2015 15,193us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear    
2016 19,933us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
2017 16,613us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2018 15,993us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2019 1,582us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Thereafter 187hmsy_FutureAmortizationExpenseAfterYearFour    
Amortization expense 5,077us-gaap_AmortizationOfIntangibleAssets 5,147us-gaap_AmortizationOfIntangibleAssets  
Customer Relationships      
Intangible assets      
Intangible assets, gross 102,755us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  102,755us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Less: Accumulated amortization (47,568)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  (44,020)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Intangible assets, net 55,187us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  58,735us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Restrictive Covenant      
Intangible assets      
Intangible assets, gross 18,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hmsy_RestrictiveCovenantMember
  18,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hmsy_RestrictiveCovenantMember
Less: Accumulated amortization (12,309)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hmsy_RestrictiveCovenantMember
  (11,394)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hmsy_RestrictiveCovenantMember
Intangible assets, net 5,691us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hmsy_RestrictiveCovenantMember
  6,606us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hmsy_RestrictiveCovenantMember
Trade Names      
Intangible assets      
Intangible assets, gross 17,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
  17,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Less: Accumulated amortization (8,377)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
  (7,763)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Intangible assets, net $ 8,623us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
  9,237us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Minimum | Customer Relationships      
Intangible assets      
Useful Life 5 years   5 years
Minimum | Restrictive Covenant      
Intangible assets      
Useful Life 3 years   3 years
Minimum | Trade Names      
Intangible assets      
Useful Life 3 years   3 years
Maximum | Customer Relationships      
Intangible assets      
Useful Life 10 years   10 years
Maximum | Restrictive Covenant      
Intangible assets      
Useful Life 7 years   7 years
Maximum | Trade Names      
Intangible assets      
Useful Life 5 years   5 years