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Summary of Significant Accounting Policies - Schedule of Net Revenue by Specialties and Subspecialties (Detail) (Product Concentration Risk [Member], Sales Revenue, Services, Net [Member])
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Net revenue in percentage 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1
Neonatal and Other Pediatric Subspecialties [Member]
      
Segment Reporting Information [Line Items]      
Net revenue in percentage 50.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= md_NeonatalAndOtherPediatricSubspecialtiesMember		 52.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= md_NeonatalAndOtherPediatricSubspecialtiesMember		 56.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= md_NeonatalAndOtherPediatricSubspecialtiesMember
Anesthesia [Member]
      
Segment Reporting Information [Line Items]      
Net revenue in percentage 36.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= md_AnesthesiaMember		 32.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= md_AnesthesiaMember		 27.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= md_AnesthesiaMember
Maternal-Fetal [Member]
      
Segment Reporting Information [Line Items]      
Net revenue in percentage 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= md_MaternalFetalMember		 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= md_MaternalFetalMember		 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= md_MaternalFetalMember
Pediatric Cardiology [Member]
      
Segment Reporting Information [Line Items]      
Net revenue in percentage 4.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= md_PediatricCardiologyMember		 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= md_PediatricCardiologyMember		 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= md_PediatricCardiologyMember
Other Services [Member]
      
Segment Reporting Information [Line Items]      
Net revenue in percentage 1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= md_OtherServicesMember