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Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net revenue	$ 639,395us-gaap_HealthCareOrganizationRevenue	$ 566,338us-gaap_HealthCareOrganizationRevenue
Operating expenses:
Practice salaries and benefits	419,595us-gaap_LaborAndRelatedExpense	372,040us-gaap_LaborAndRelatedExpense
Practice supplies and other operating expenses	23,431md_PracticeSuppliesAndOtherOperatingExpenses	21,417md_PracticeSuppliesAndOtherOperatingExpenses
General and administrative expenses	67,936us-gaap_GeneralAndAdministrativeExpense	58,414us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	13,612us-gaap_DepreciationDepletionAndAmortization	10,370us-gaap_DepreciationDepletionAndAmortization
Total operating expenses	524,574us-gaap_OperatingExpenses	462,241us-gaap_OperatingExpenses
Income from operations	114,821us-gaap_OperatingIncomeLoss	104,097us-gaap_OperatingIncomeLoss
Investment income	142us-gaap_InvestmentIncomeNet	1,635us-gaap_InvestmentIncomeNet
Interest expense	(3,267)us-gaap_InterestExpense	(1,371)us-gaap_InterestExpense
Equity in earnings of unconsolidated affiliate	821us-gaap_IncomeLossFromEquityMethodInvestments
Total non-operating (expenses) income	(2,304)us-gaap_NonoperatingIncomeExpense	264us-gaap_NonoperatingIncomeExpense
Income before income taxes	112,517us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	104,361us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax provision	43,928us-gaap_IncomeTaxExpenseBenefit	40,701us-gaap_IncomeTaxExpenseBenefit
Net income	68,589us-gaap_ProfitLoss	63,660us-gaap_ProfitLoss
Net loss attributable to noncontrolling interests	118us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to MEDNAX, Inc.	$ 68,707us-gaap_NetIncomeLoss	$ 63,660us-gaap_NetIncomeLoss
Net income attributable to MEDNAX, Inc.:
Earnings per share, Basic	$ 0.73us-gaap_EarningsPerShareBasic	$ 0.64us-gaap_EarningsPerShareBasic
Earnings per share, Diluted	$ 0.72us-gaap_EarningsPerShareDiluted	$ 0.63us-gaap_EarningsPerShareDiluted
Weighted average common shares:
Basic	94,231us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,076us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	95,325us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	100,696us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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X

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

+ Details

Name:	us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration