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General (Details 8) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Taxes      
Effective income tax rates (as a percent) 36.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 51.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
The ownership percentage for which the entity files a consolidated federal income tax return, low end of range 80.00%mgln_MinorityInterestOwnershipPercentageByParentMinimum    
Deferred Tax Assets, Valuation Allowance $ 11.9us-gaap_DeferredTaxAssetsValuationAllowance   $ 12.4us-gaap_DeferredTaxAssetsValuationAllowance
Federal      
Income Taxes      
Operating Loss Carryforwards 3.0us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
   
State      
Income Taxes      
Operating Loss Carryforwards 160.5us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
   
AlphaCare | Federal      
Income Taxes      
Operating Loss Carryforwards $ 24.5us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mgln_AlphaCareOfNewYorkIncMember