Details of Certain Balance Sheet Accounts - Other Long-Term Obligations (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Details Of Certain Balance Sheet Accounts [Abstract]
Reserve for Uncertain Tax Positions	$ 500,000	$ 3,900,000
Deferred compensation plan liability	3,300,000amed_DeferredCompensationPlanLiability	3,400,000amed_DeferredCompensationPlanLiability
Other	1,500,000	1,200,000
Other long-term obligations	$ 5,285,000us-gaap_OtherLiabilitiesNoncurrent	$ 8,511,000us-gaap_OtherLiabilitiesNoncurrent

Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 24

-Article 5

Name:	us-gaap_OtherLiabilitiesNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant