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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Accounts payable $ 22,826us-gaap_AccountsPayableCurrent $ 32,783us-gaap_AccountsPayableCurrent
Accrued salaries and bonuses 80,541us-gaap_AccruedSalariesCurrent 231,390us-gaap_AccruedSalariesCurrent
Accrued payroll taxes and benefits 40,379md_AccruedPayrollTaxesAndBenefits 49,858md_AccruedPayrollTaxesAndBenefits
Accrued professional liabilities 20,432us-gaap_MalpracticeLossContingencyAccrualUndiscountedCurrent 19,718us-gaap_MalpracticeLossContingencyAccrualUndiscountedCurrent
Accrued contingent consideration 18,264md_AccruedContingentConsiderationLiability 17,010md_AccruedContingentConsiderationLiability
Other accrued expenses 29,848us-gaap_OtherAccruedLiabilitiesCurrent 29,899us-gaap_OtherAccruedLiabilitiesCurrent
Accounts payable and accrued expenses, total $ 212,290us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 380,658us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent