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Selected Quarterly Financial Information - Summary of Company's Selected Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	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
Quarterly Financial Information Disclosure [Abstract]
Net revenue	$ 650,525us-gaap_HealthCareOrganizationRevenue	$ 626,506us-gaap_HealthCareOrganizationRevenue	$ 595,544us-gaap_HealthCareOrganizationRevenue	$ 566,338us-gaap_HealthCareOrganizationRevenue	$ 567,387us-gaap_HealthCareOrganizationRevenue	$ 554,730us-gaap_HealthCareOrganizationRevenue	$ 529,180us-gaap_HealthCareOrganizationRevenue	$ 502,715us-gaap_HealthCareOrganizationRevenue	$ 2,438,913us-gaap_HealthCareOrganizationRevenue	$ 2,154,012us-gaap_HealthCareOrganizationRevenue	$ 1,816,612us-gaap_HealthCareOrganizationRevenue
Practice salaries and benefits	404,345us-gaap_LaborAndRelatedExpense	394,794us-gaap_LaborAndRelatedExpense	372,216us-gaap_LaborAndRelatedExpense	372,040us-gaap_LaborAndRelatedExpense	353,316us-gaap_LaborAndRelatedExpense	346,879us-gaap_LaborAndRelatedExpense	331,922us-gaap_LaborAndRelatedExpense	329,201us-gaap_LaborAndRelatedExpense	1,543,395us-gaap_LaborAndRelatedExpense	1,361,318us-gaap_LaborAndRelatedExpense	1,130,913us-gaap_LaborAndRelatedExpense
Practice supplies and other operating expenses	23,549md_PracticeSuppliesAndOtherOperatingExpenses	21,570md_PracticeSuppliesAndOtherOperatingExpenses	22,466md_PracticeSuppliesAndOtherOperatingExpenses	21,417md_PracticeSuppliesAndOtherOperatingExpenses	24,027md_PracticeSuppliesAndOtherOperatingExpenses	19,445md_PracticeSuppliesAndOtherOperatingExpenses	19,416md_PracticeSuppliesAndOtherOperatingExpenses	19,500md_PracticeSuppliesAndOtherOperatingExpenses	89,002md_PracticeSuppliesAndOtherOperatingExpenses	82,388md_PracticeSuppliesAndOtherOperatingExpenses	71,823md_PracticeSuppliesAndOtherOperatingExpenses
General and administrative expenses	67,641us-gaap_GeneralAndAdministrativeExpense	60,643us-gaap_GeneralAndAdministrativeExpense	60,829us-gaap_GeneralAndAdministrativeExpense	58,414us-gaap_GeneralAndAdministrativeExpense	55,636us-gaap_GeneralAndAdministrativeExpense	54,654us-gaap_GeneralAndAdministrativeExpense	54,601us-gaap_GeneralAndAdministrativeExpense	53,318us-gaap_GeneralAndAdministrativeExpense	247,527us-gaap_GeneralAndAdministrativeExpense	218,209us-gaap_GeneralAndAdministrativeExpense	193,540us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	13,903us-gaap_DepreciationDepletionAndAmortization	11,356us-gaap_DepreciationDepletionAndAmortization	10,361us-gaap_DepreciationDepletionAndAmortization	10,370us-gaap_DepreciationDepletionAndAmortization	10,491us-gaap_DepreciationDepletionAndAmortization	10,461us-gaap_DepreciationDepletionAndAmortization	9,870us-gaap_DepreciationDepletionAndAmortization	9,144us-gaap_DepreciationDepletionAndAmortization	45,990us-gaap_DepreciationDepletionAndAmortization	39,966us-gaap_DepreciationDepletionAndAmortization	30,816us-gaap_DepreciationDepletionAndAmortization
Total operating expenses	509,438us-gaap_OperatingExpenses	488,363us-gaap_OperatingExpenses	465,872us-gaap_OperatingExpenses	462,241us-gaap_OperatingExpenses	443,470us-gaap_OperatingExpenses	431,439us-gaap_OperatingExpenses	415,809us-gaap_OperatingExpenses	411,163us-gaap_OperatingExpenses	1,925,914us-gaap_OperatingExpenses	1,701,881us-gaap_OperatingExpenses	1,427,092us-gaap_OperatingExpenses
Income from operations	141,087us-gaap_OperatingIncomeLoss	138,143us-gaap_OperatingIncomeLoss	129,672us-gaap_OperatingIncomeLoss	104,097us-gaap_OperatingIncomeLoss	123,917us-gaap_OperatingIncomeLoss	123,291us-gaap_OperatingIncomeLoss	113,371us-gaap_OperatingIncomeLoss	91,552us-gaap_OperatingIncomeLoss	512,999us-gaap_OperatingIncomeLoss	452,131us-gaap_OperatingIncomeLoss	389,520us-gaap_OperatingIncomeLoss
Investment income	195us-gaap_InvestmentIncomeNet	563us-gaap_InvestmentIncomeNet	335us-gaap_InvestmentIncomeNet	1,635us-gaap_InvestmentIncomeNet	526us-gaap_InvestmentIncomeNet	372us-gaap_InvestmentIncomeNet	396us-gaap_InvestmentIncomeNet	402us-gaap_InvestmentIncomeNet	2,728us-gaap_InvestmentIncomeNet	1,696us-gaap_InvestmentIncomeNet	1,896us-gaap_InvestmentIncomeNet
Interest expense	(3,313)us-gaap_InterestExpense	(2,019)us-gaap_InterestExpense	(2,188)us-gaap_InterestExpense	(1,371)us-gaap_InterestExpense	(1,046)us-gaap_InterestExpense	(1,507)us-gaap_InterestExpense	(1,673)us-gaap_InterestExpense	(1,189)us-gaap_InterestExpense	(8,891)us-gaap_InterestExpense	(5,415)us-gaap_InterestExpense	(3,245)us-gaap_InterestExpense
Equity in earnings of unconsolidated affiliate	905us-gaap_IncomeLossFromEquityMethodInvestments	725us-gaap_IncomeLossFromEquityMethodInvestments	150us-gaap_IncomeLossFromEquityMethodInvestments						1,780us-gaap_IncomeLossFromEquityMethodInvestments
Total non-operating expenses	(2,213)us-gaap_NonoperatingIncomeExpense	(731)us-gaap_NonoperatingIncomeExpense	(1,703)us-gaap_NonoperatingIncomeExpense	264us-gaap_NonoperatingIncomeExpense					(4,383)us-gaap_NonoperatingIncomeExpense	(3,719)us-gaap_NonoperatingIncomeExpense	(1,349)us-gaap_NonoperatingIncomeExpense
Income before income taxes	138,874us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	137,412us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	127,969us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	104,361us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	123,397us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	122,156us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	112,094us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	90,765us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	508,616us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	448,412us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	388,171us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax provision	50,594us-gaap_IncomeTaxExpenseBenefit	51,174us-gaap_IncomeTaxExpenseBenefit	48,944us-gaap_IncomeTaxExpenseBenefit	40,701us-gaap_IncomeTaxExpenseBenefit	44,423us-gaap_IncomeTaxExpenseBenefit	45,198us-gaap_IncomeTaxExpenseBenefit	42,876us-gaap_IncomeTaxExpenseBenefit	35,398us-gaap_IncomeTaxExpenseBenefit	191,413us-gaap_IncomeTaxExpenseBenefit	167,895us-gaap_IncomeTaxExpenseBenefit	147,264us-gaap_IncomeTaxExpenseBenefit
Net income	88,280us-gaap_ProfitLoss	86,238us-gaap_ProfitLoss	79,025us-gaap_ProfitLoss	63,660us-gaap_ProfitLoss					317,203us-gaap_ProfitLoss	280,517us-gaap_ProfitLoss	240,907us-gaap_ProfitLoss
Net (income) loss attributable to noncontrolling interests	118us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(31)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(9)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest						78us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to MEDNAX, Inc.	$ 88,398us-gaap_NetIncomeLoss	$ 86,207us-gaap_NetIncomeLoss	$ 79,016us-gaap_NetIncomeLoss	$ 63,660us-gaap_NetIncomeLoss	$ 78,974us-gaap_NetIncomeLoss	$ 76,958us-gaap_NetIncomeLoss	$ 69,218us-gaap_NetIncomeLoss	$ 55,367us-gaap_NetIncomeLoss	$ 317,281us-gaap_NetIncomeLoss	$ 280,517us-gaap_NetIncomeLoss	$ 240,907us-gaap_NetIncomeLoss
Earnings per share, Basic	$ 0.90us-gaap_EarningsPerShareBasic	$ 0.87us-gaap_EarningsPerShareBasic	$ 0.80us-gaap_EarningsPerShareBasic	$ 0.64us-gaap_EarningsPerShareBasic	$ 0.79us-gaap_EarningsPerShareBasic	$ 0.77us-gaap_EarningsPerShareBasic	$ 0.70us-gaap_EarningsPerShareBasic	$ 0.56us-gaap_EarningsPerShareBasic	$ 3.22us-gaap_EarningsPerShareBasic	$ 2.83us-gaap_EarningsPerShareBasic	$ 2.47us-gaap_EarningsPerShareBasic
Earnings per share, Diluted	$ 0.89us-gaap_EarningsPerShareDiluted	$ 0.86us-gaap_EarningsPerShareDiluted	$ 0.79us-gaap_EarningsPerShareDiluted	$ 0.63us-gaap_EarningsPerShareDiluted	$ 0.78us-gaap_EarningsPerShareDiluted	$ 0.76us-gaap_EarningsPerShareDiluted	$ 0.68us-gaap_EarningsPerShareDiluted	$ 0.55us-gaap_EarningsPerShareDiluted	$ 3.18us-gaap_EarningsPerShareDiluted	$ 2.78us-gaap_EarningsPerShareDiluted	$ 2.42us-gaap_EarningsPerShareDiluted
Weighted average shares, Basic	98,066us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,088us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	98,411us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,076us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,469us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,506us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,116us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	98,618us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	98,588us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,112us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	97,386us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average shares, Diluted	99,129us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	100,145us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	99,866us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	100,696us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	101,080us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	101,178us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	101,098us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	100,784us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	99,887us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	100,969us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	99,382us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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