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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Payables and Accruals [Abstract]    
Accounts payable $ 32,783us-gaap_AccountsPayableCurrent $ 18,605us-gaap_AccountsPayableCurrent
Accrued salaries and bonuses 231,390us-gaap_AccruedSalariesCurrent 189,439us-gaap_AccruedSalariesCurrent
Accrued payroll taxes and benefits 49,858us-gaap_EmployeeRelatedLiabilitiesCurrent 43,403us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued professional liability 19,718us-gaap_MalpracticeLossContingencyAccrualUndiscountedCurrent 19,324us-gaap_MalpracticeLossContingencyAccrualUndiscountedCurrent
Accrued contingent consideration 17,010md_AccruedContingentConsiderationLiability 19,833md_AccruedContingentConsiderationLiability
Other accrued expenses 29,899us-gaap_OtherAccruedLiabilitiesCurrent 18,150us-gaap_OtherAccruedLiabilitiesCurrent
Accounts payable and accrued expenses, total $ 380,658us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 308,754us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent