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General (Details 5) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Apr. 30, 2014
Jul. 01, 2014
Fair value measurement of contingent consideration        
Fair value of the short term contingent consideration $ 11,800,000us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent      
Fair value of the long term contingent consideration 61,319,000us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent 49,839,000us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent    
Fair value of the contingent consideration 73,122,000mgln_ContingentLiabilitiesFairValueDisclosure      
Changes in fair value of contingent liabilities in relation to acquisition 14,969,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1      
Liability for contingent consideration        
Balance as of beginning of period 58,153,000mgln_ContingentLiabilitiesFairValueDisclosure      
Changes in fair value 14,969,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1      
Balance as of end of period 73,122,000mgln_ContingentLiabilitiesFairValueDisclosure      
Direct service costs and other operating expenses        
Fair value measurement of contingent consideration        
Changes in fair value of contingent liabilities in relation to acquisition 15,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_IncomeStatementLocationAxis
= mgln_DirectServiceCostsAndOtherOperatingExpensesMember		      
Liability for contingent consideration        
Changes in fair value 15,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_IncomeStatementLocationAxis
= mgln_DirectServiceCostsAndOtherOperatingExpensesMember		      
CDMI        
Contingent consideration disclosures        
Maximum potential contingent payments     165,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= mgln_CDMILLCMember		  
Fair value measurement of contingent consideration        
Fair values inputs - Discount Rate (as a percent) 14.50%mgln_ContingentConsiderationFairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= mgln_CDMILLCMember		      
Estimated undiscounted future contingent payments 80,600,000mgln_BusinessCombinationContingentConsiderationEstimatedContingentPayments
/ us-gaap_BusinessAcquisitionAxis
= mgln_CDMILLCMember		 65,700,000mgln_BusinessCombinationContingentConsiderationEstimatedContingentPayments
/ us-gaap_BusinessAcquisitionAxis
= mgln_CDMILLCMember		    
Fair value of the short term contingent consideration 11,500,000us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
/ us-gaap_BusinessAcquisitionAxis
= mgln_CDMILLCMember		      
Fair value of the long term contingent consideration 58,300,000us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= mgln_CDMILLCMember		      
CDMI | Minimum        
Fair value measurement of contingent consideration        
Fair value inputs - Probability Of Payment (as a percent) 0.00%mgln_ContingentConsiderationFairValueInputsProbabilityOfPaymentRate
/ us-gaap_BusinessAcquisitionAxis
= mgln_CDMILLCMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
CDMI | Maximum        
Fair value measurement of contingent consideration        
Fair value inputs - Probability Of Payment (as a percent) 100.00%mgln_ContingentConsiderationFairValueInputsProbabilityOfPaymentRate
/ us-gaap_BusinessAcquisitionAxis
= mgln_CDMILLCMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Cobalt        
Contingent consideration disclosures        
Maximum potential contingent payments       6,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= mgln_CobaltllcMember
Fair value measurement of contingent consideration        
Fair values inputs - Discount Rate (as a percent) 14.50%mgln_ContingentConsiderationFairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= mgln_CobaltllcMember		      
Estimated undiscounted future contingent payments 4,200,000mgln_BusinessCombinationContingentConsiderationEstimatedContingentPayments
/ us-gaap_BusinessAcquisitionAxis
= mgln_CobaltllcMember		 4,200,000mgln_BusinessCombinationContingentConsiderationEstimatedContingentPayments
/ us-gaap_BusinessAcquisitionAxis
= mgln_CobaltllcMember		    
Fair value of the short term contingent consideration 300,000us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
/ us-gaap_BusinessAcquisitionAxis
= mgln_CobaltllcMember		      
Fair value of the long term contingent consideration $ 3,000,000us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= mgln_CobaltllcMember		      
Cobalt | Minimum        
Fair value measurement of contingent consideration        
Fair value inputs - Probability Of Payment (as a percent) 5.00%mgln_ContingentConsiderationFairValueInputsProbabilityOfPaymentRate
/ us-gaap_BusinessAcquisitionAxis
= mgln_CobaltllcMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Cobalt | Maximum        
Fair value measurement of contingent consideration        
Fair value inputs - Probability Of Payment (as a percent) 70.00%mgln_ContingentConsiderationFairValueInputsProbabilityOfPaymentRate
/ us-gaap_BusinessAcquisitionAxis
= mgln_CobaltllcMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember