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Operating Income of Reportable Segments (Detail) (USD $)
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
Segment Reporting Information [Line Items]                      
Net service revenue $ 300,500,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 300,300,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 305,000,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 298,700,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 303,500,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 301,300,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 315,900,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 328,600,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 1,204,554,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 1,249,344,000us-gaap_HealthCareOrganizationPatientServiceRevenue $ 1,440,836,000us-gaap_HealthCareOrganizationPatientServiceRevenue
Cost of service, excluding depreciation and amortization                 691,061,000us-gaap_CostOfServices 717,996,000us-gaap_CostOfServices 810,704,000us-gaap_CostOfServices
General and administrative expenses                 441,700,000amed_GeneralAndAdministrativeExpenseSegment 474,000,000amed_GeneralAndAdministrativeExpenseSegment 516,700,000amed_GeneralAndAdministrativeExpenseSegment
Provision for doubtful accounts                 16,294,000amed_ProvisionForDoubtfulAccountsForContinuingOperations 15,882,000amed_ProvisionForDoubtfulAccountsForContinuingOperations 21,011,000amed_ProvisionForDoubtfulAccountsForContinuingOperations
Depreciation and amortization                 28,307,000amed_DepreciationAndAmortizationForContinuingOperations 36,871,000amed_DepreciationAndAmortizationForContinuingOperations 39,200,000amed_DepreciationAndAmortizationForContinuingOperations
U.S. Department of Justice settlement                 0amed_UsDepartmentOfJusticeSettlement 150,000,000amed_UsDepartmentOfJusticeSettlement 0amed_UsDepartmentOfJusticeSettlement
Goodwill and other intangibles impairment charge                 3,107,000us-gaap_GoodwillAndIntangibleAssetImpairment 9,492,000us-gaap_GoodwillAndIntangibleAssetImpairment 162,103,000us-gaap_GoodwillAndIntangibleAssetImpairment
Operating expenses                 1,180,507,000us-gaap_CostsAndExpenses 1,404,315,000us-gaap_CostsAndExpenses 1,549,691,000us-gaap_CostsAndExpenses
Operating income (loss)                 24,047,000us-gaap_OperatingIncomeLoss (154,971,000)us-gaap_OperatingIncomeLoss (108,855,000)us-gaap_OperatingIncomeLoss
Home Health [Member]                      
Segment Reporting Information [Line Items]                      
Net service revenue                 956,900,000us-gaap_HealthCareOrganizationPatientServiceRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
987,700,000us-gaap_HealthCareOrganizationPatientServiceRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
1,152,100,000us-gaap_HealthCareOrganizationPatientServiceRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
Cost of service, excluding depreciation and amortization                 559,400,000us-gaap_CostOfServices
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
578,900,000us-gaap_CostOfServices
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
661,400,000us-gaap_CostOfServices
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
General and administrative expenses                 269,000,000amed_GeneralAndAdministrativeExpenseSegment
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
304,800,000amed_GeneralAndAdministrativeExpenseSegment
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
331,600,000amed_GeneralAndAdministrativeExpenseSegment
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
Provision for doubtful accounts                 14,800,000amed_ProvisionForDoubtfulAccountsForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
10,200,000amed_ProvisionForDoubtfulAccountsForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
17,100,000amed_ProvisionForDoubtfulAccountsForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
Depreciation and amortization                 9,000,000amed_DepreciationAndAmortizationForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
10,300,000amed_DepreciationAndAmortizationForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
13,200,000amed_DepreciationAndAmortizationForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
U.S. Department of Justice settlement                   0amed_UsDepartmentOfJusticeSettlement
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
 
Goodwill and other intangibles impairment charge                 1,600,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
8,500,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
161,600,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
Operating expenses                 853,800,000us-gaap_CostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
912,700,000us-gaap_CostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
1,184,900,000us-gaap_CostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
Operating income (loss)                 103,100,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
75,000,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
(32,800,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HomeHealthMember
Hospice [Member]                      
Segment Reporting Information [Line Items]                      
Net service revenue                 247,600,000us-gaap_HealthCareOrganizationPatientServiceRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
261,600,000us-gaap_HealthCareOrganizationPatientServiceRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
288,700,000us-gaap_HealthCareOrganizationPatientServiceRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
Cost of service, excluding depreciation and amortization                 131,700,000us-gaap_CostOfServices
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
139,100,000us-gaap_CostOfServices
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
149,300,000us-gaap_CostOfServices
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
General and administrative expenses                 58,300,000amed_GeneralAndAdministrativeExpenseSegment
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
64,700,000amed_GeneralAndAdministrativeExpenseSegment
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
71,800,000amed_GeneralAndAdministrativeExpenseSegment
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
Provision for doubtful accounts                 1,500,000amed_ProvisionForDoubtfulAccountsForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
5,700,000amed_ProvisionForDoubtfulAccountsForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
3,900,000amed_ProvisionForDoubtfulAccountsForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
Depreciation and amortization                 2,100,000amed_DepreciationAndAmortizationForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
2,100,000amed_DepreciationAndAmortizationForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
1,500,000amed_DepreciationAndAmortizationForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
U.S. Department of Justice settlement                   0amed_UsDepartmentOfJusticeSettlement
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
 
Goodwill and other intangibles impairment charge                 1,500,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
1,000,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
500,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
Operating expenses                 195,100,000us-gaap_CostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
212,600,000us-gaap_CostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
227,000,000us-gaap_CostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
Operating income (loss)                 52,500,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
49,000,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
61,700,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= amed_HospiceMember
All Other Segments [Member]                      
Segment Reporting Information [Line Items]                      
Net service revenue                 0us-gaap_HealthCareOrganizationPatientServiceRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
0us-gaap_HealthCareOrganizationPatientServiceRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
0us-gaap_HealthCareOrganizationPatientServiceRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Cost of service, excluding depreciation and amortization                 0us-gaap_CostOfServices
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
0us-gaap_CostOfServices
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
0us-gaap_CostOfServices
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
General and administrative expenses                 114,400,000amed_GeneralAndAdministrativeExpenseSegment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
104,500,000amed_GeneralAndAdministrativeExpenseSegment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
113,300,000amed_GeneralAndAdministrativeExpenseSegment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Provision for doubtful accounts                 0amed_ProvisionForDoubtfulAccountsForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
0amed_ProvisionForDoubtfulAccountsForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
0amed_ProvisionForDoubtfulAccountsForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Depreciation and amortization                 17,200,000amed_DepreciationAndAmortizationForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
24,500,000amed_DepreciationAndAmortizationForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
24,500,000amed_DepreciationAndAmortizationForContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
U.S. Department of Justice settlement                   150,000,000amed_UsDepartmentOfJusticeSettlement
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
 
Goodwill and other intangibles impairment charge                 0us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
0us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
0us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Operating expenses                 131,600,000us-gaap_CostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
279,000,000us-gaap_CostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
137,800,000us-gaap_CostsAndExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Operating income (loss)                 $ (131,600,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
$ (279,000,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
$ (137,800,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember