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Goodwill And Intangible Assets (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Goodwill $ 3,500,668,000us-gaap_Goodwill   $ 3,381,149,000us-gaap_Goodwill
Increase in goodwill 120,588,000us-gaap_GoodwillAcquiredDuringPeriod    
Goodwill deductible for tax purposes 49,400,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount 4,700,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount  
Amortization of Intangible Assets 16,600,000us-gaap_AmortizationOfIntangibleAssets 600,000us-gaap_AmortizationOfIntangibleAssets  
Estimated amortization of intangible assets, remainder of 2014 50,800,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear    
Estimated amortization of intangible assets, 2015 67,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Estimated amortization of intangible assets, 2016 65,700,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Estimated amortization of intangible assets, 2017 64,700,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Estimated amortization of intangible assets, 2018 62,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Estimated amortization of intangible assets, 2019 59,600,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Estimated amortization of intangible assets, 2020 and thereafter 698,500,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Weighted average amortization period 18 years 37 days    
Ambulatory Services [Member]      
Segment Reporting Information [Line Items]      
Goodwill 2,000,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_AmbulatoryServicesMember		    
Increase in goodwill 60,500,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_AmbulatoryServicesMember		    
Physician Services [Member]      
Segment Reporting Information [Line Items]      
Goodwill 1,500,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_PhysicianServicesMember		    
Increase in goodwill 59,000,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_PhysicianServicesMember		    
Series of Individually Immaterial Business Acquisitions [Member]      
Segment Reporting Information [Line Items]      
Goodwill 117,141,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember		 [1] 8,260,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember		  
Intangible assets 44,663,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember		 [1] 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember		  
Series of Individually Immaterial Business Acquisitions [Member] | Physician Services [Member]      
Segment Reporting Information [Line Items]      
Number of business acquisitions 3us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_PhysicianServicesMember		    
Controlling Interest [Member] | Ambulatory Services [Member]      
Segment Reporting Information [Line Items]      
Number of business acquisitions 1us-gaap_NumberOfBusinessesAcquired
/ amsg_AcquisitionInterestAxis
= amsg_ControllingInterestMember
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_AmbulatoryServicesMember		 1us-gaap_NumberOfBusinessesAcquired
/ amsg_AcquisitionInterestAxis
= amsg_ControllingInterestMember
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_AmbulatoryServicesMember		  
Controlling Interest [Member] | Joint Venture [Member] | Ambulatory Services [Member]      
Segment Reporting Information [Line Items]      
Number consolidated centers contributed to joint venture 1amsg_NumberOfConsolidatedCentersContributedToJointVenture
/ amsg_AcquisitionInterestAxis
= amsg_ControllingInterestMember
/ us-gaap_BusinessAcquisitionAxis
= amsg_JointVentureMember
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_AmbulatoryServicesMember		 1amsg_NumberOfConsolidatedCentersContributedToJointVenture
/ amsg_AcquisitionInterestAxis
= amsg_ControllingInterestMember
/ us-gaap_BusinessAcquisitionAxis
= amsg_JointVentureMember
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_AmbulatoryServicesMember		  
Customer relationships with hospitals [Member]      
Segment Reporting Information [Line Items]      
Amount estimated to be amortized over weighted average period $ 44,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		    
Weighted average period of amortization 20 years    
[1] Represents the preliminary allocation of fair value of acquired assets and liabilities associated with these acquisitions at March 31, 2015.