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Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Bad debt expense   $ 139,274us-gaap_ProvisionForDoubtfulAccounts $ 21,947us-gaap_ProvisionForDoubtfulAccounts $ 20,005us-gaap_ProvisionForDoubtfulAccounts
Allowances for accounts receivable 113,357us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 113,357us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 27,862us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent  
Product Concentration Risk [Member] | Allowance for Doubtful Accounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for doubtful accounts related to fee for service patient visits   73.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AllowanceForDoubtfulAccountsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
   
Ambulatory Services [Member] | Other Operating Expenses [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Bad debt expense   21,900us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_IncomeStatementLocationAxis
= amsg_OtherOperatingExpensesMember
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_AmbulatoryServicesMember
21,700us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_IncomeStatementLocationAxis
= amsg_OtherOperatingExpensesMember
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_AmbulatoryServicesMember
19,600us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_IncomeStatementLocationAxis
= amsg_OtherOperatingExpensesMember
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_AmbulatoryServicesMember
Physician Services [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Bad debt expense $ 117,001us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_PhysicianServicesMember
[1] $ 117,001us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_PhysicianServicesMember
$ 0us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_PhysicianServicesMember
$ 0us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_StatementBusinessSegmentsAxis
= amsg_PhysicianServicesMember
[1] Net revenue by payor is for the period July 16, 2014, the date of the acquisition of Sheridan, through December 31, 2014. As such, historical amounts are not included.