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Discontinued Operations and Assets Held For Sale - Additional Information (Detail)
9 Months Ended 12 Months Ended 3 Months Ended
Sep. 30, 2013
Agencies
Dec. 31, 2014
Agencies
Dec. 31, 2013
Agencies
Dec. 31, 2012
Agencies
Jun. 30, 2014
Agencies
Mar. 31, 2014
Agencies
Home Health [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of care centers consolidated   21amed_NumberOfCareCentersConsolidated
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
41amed_NumberOfCareCentersConsolidated
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
5amed_NumberOfCareCentersConsolidated
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
   
Number of care centers closed   22amed_NumberOfCareCentersClosed
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
10amed_NumberOfCareCentersClosed
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
3amed_NumberOfCareCentersClosed
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
   
Number of care centers available for sale 28amed_NumberOfCareCentersAvailableForSale
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
0amed_NumberOfCareCentersAvailableForSale
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
3amed_NumberOfCareCentersAvailableForSale
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
     
Number of care centers sold     19amed_NumberOfCareCentersSold
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
     
Number of care centers included in discontinued operations     32amed_NumberOfCareCentersIncludedInDiscontinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
3amed_NumberOfCareCentersIncludedInDiscontinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
   
Home Health [Member] | Assets Held-for-sale [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of care centers consolidated           1amed_NumberOfCareCentersConsolidated
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= us-gaap_AssetsHeldForSaleMember
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
Number of care centers sold         1amed_NumberOfCareCentersSold
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= us-gaap_AssetsHeldForSaleMember
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
1amed_NumberOfCareCentersSold
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= us-gaap_AssetsHeldForSaleMember
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
Hospice [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of care centers consolidated   4amed_NumberOfCareCentersConsolidated
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
5amed_NumberOfCareCentersConsolidated
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
4amed_NumberOfCareCentersConsolidated
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
   
Number of care centers closed   4amed_NumberOfCareCentersClosed
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
       
Number of care centers sold     1amed_NumberOfCareCentersSold
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
     
Number of care centers included in discontinued operations     1amed_NumberOfCareCentersIncludedInDiscontinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember