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Summary of Significant Accounting Policies (Details 11) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cost of Care, Medical Claims Payable and Other Medical Liabilities                      
Period considered for comparing medical claims trend                 2 months    
Minimum completion factor of insured claims to make projection from historical completion and payment patterns (as a percent)                 70.00%mgln_MinimumCompletionFactorOfInsuredClaimsToMakeProjectionFromHistoricalCompletionAndPaymentPatterns    
Changes in medical claims payable                      
Claims payable and IBNR, beginning of period       $ 242,229,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense       $ 222,929,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense $ 242,229,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense $ 222,929,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense $ 157,099,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Cost of care:                      
Current year                 2,097,395,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense 2,264,276,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense 2,076,190,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
Prior years (3)                 (8,800,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense (31,300,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense (4,300,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Total cost of care 506,090,000us-gaap_HealthCareOrganizationExpensesNet 495,180,000us-gaap_HealthCareOrganizationExpensesNet 481,617,000us-gaap_HealthCareOrganizationExpensesNet 605,708,000us-gaap_HealthCareOrganizationExpensesNet 605,782,000us-gaap_HealthCareOrganizationExpensesNet 564,537,000us-gaap_HealthCareOrganizationExpensesNet 537,630,000us-gaap_HealthCareOrganizationExpensesNet 525,027,000us-gaap_HealthCareOrganizationExpensesNet 2,088,595,000us-gaap_HealthCareOrganizationExpensesNet 2,232,976,000us-gaap_HealthCareOrganizationExpensesNet 2,071,890,000us-gaap_HealthCareOrganizationExpensesNet
Claim payments and transfers to other medical liabilities:                      
Current year                 1,845,325,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 2,053,274,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 1,877,459,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
Prior years                 206,696,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 160,402,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 128,601,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1
Total claim payments and transfers to other medical liabilities                 2,052,021,000us-gaap_PaymentsForLossesAndLossAdjustmentExpense 2,213,676,000us-gaap_PaymentsForLossesAndLossAdjustmentExpense 2,006,060,000us-gaap_PaymentsForLossesAndLossAdjustmentExpense
Claims payable and IBNR, end of period 278,803,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense       242,229,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense       278,803,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense 242,229,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense 222,929,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Withhold receivables, end of period (321,000)us-gaap_ReinsuranceRecoverables       (13,888,000)us-gaap_ReinsuranceRecoverables       (321,000)us-gaap_ReinsuranceRecoverables (13,888,000)us-gaap_ReinsuranceRecoverables (24,500,000)us-gaap_ReinsuranceRecoverables
Medical claims payable, end of period 278,482,000mgln_MedicalClaimsPayableCurrent       228,341,000mgln_MedicalClaimsPayableCurrent       278,482,000mgln_MedicalClaimsPayableCurrent 228,341,000mgln_MedicalClaimsPayableCurrent 198,429,000mgln_MedicalClaimsPayableCurrent
Prior years cost of care claims relating to annual reconciliation process with certain providers                   15,100,000mgln_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsRelatedToAnnualReconciliationProcessWithCertainProviders  
Prior years cost of care claims relating to adjustments new contracts to providers                   8,300,000mgln_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsRelatedToNewContractsPriorYears  
Prior years cost of care claims relating to adjustments faster claims to providers                   7,900,000mgln_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsRelatedToFasterClaimsPriorYears  
Advertising Costs                      
Advertising expense                 2,700,000us-gaap_AdvertisingExpense 2,300,000us-gaap_AdvertisingExpense 2,000,000us-gaap_AdvertisingExpense
Accrued Liabilities                      
Disclosure threshold (as a percent)                 5.00%mgln_ThresholdForDisclosurePercentage 5.00%mgln_ThresholdForDisclosurePercentage  
Accrued employee compensation liabilities 47,000,000us-gaap_EmployeeRelatedLiabilitiesCurrent       40,200,000us-gaap_EmployeeRelatedLiabilitiesCurrent       47,000,000us-gaap_EmployeeRelatedLiabilitiesCurrent 40,200,000us-gaap_EmployeeRelatedLiabilitiesCurrent  
Deferred Revenue $ 29,800,000us-gaap_DeferredRevenue               $ 29,800,000us-gaap_DeferredRevenue