Applicable Margin Rate On Base Rate

No definition available.

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- Definition

Applicable Margin Rate On Eurodollar Rate

+ References

No definition available.

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- Definition

Debt Instrument Interest ABR Flat Rate

+ References

No definition available.

+ Details

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- Definition

Debt Instrument Interest Additional Interest Above ABR Rate

+ References

No definition available.

+ Details

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- Definition

Debt Instrument Interest Additional Interest Above Eurodollar Rate

+ References

No definition available.

+ Details

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- Definition

Debt Instrument Interest Additional Interest Above Federal Fund Rate

+ References

No definition available.

+ Details

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- Definition

Debt Instrument Interest Additional Interest Above One Month Eurodollar Rate

+ References

No definition available.

+ Details

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- Definition

Debt Instrument Interest LIBOR Floor

+ References

No definition available.

+ Details

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- Definition

Debt instrument, number of quarterly installments

+ References

No definition available.

+ Details

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- Definition

Eurodollar Deposits Interest Period

+ References

No definition available.

+ Details

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- Definition

Ratio of adjusted earnings before interest, taxes , depreciation and amortization plus rent expense to certain fixed charges (interest expense, required principal payments and capital expenditures).

+ References

No definition available.

+ Details

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- Definition

Prepayment Penalty Percentage

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

No authoritative reference available.

+ References

No definition available.

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- Definition

Senior secured leverage ratio

+ References

No definition available.

+ Details

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- Definition

Ratio of debt to earnings before interest, taxes, depreciation and amortization.

+ References

No definition available.

+ Details

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- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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- Details

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

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

+ Details

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- Definition

Amount of the required periodic payments applied to principal.

+ References

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 210.5-02.22)

-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 22

-Article 5

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Balance Type:	debit
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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 210.5-02.19(b),22(b))

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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 210.5-02.19(b),22(b))

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Long Term Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Oct. 26, 2012	Jul. 28, 2014
Debt Instrument [Line Items]
Total leverage ratio	1.5amed_TotalLeverageRatio
Fixed charge coverage ratio	2.3amed_FixedChargeCoverageRatio
Credit facility, maximum borrowing capacity			$ 225.0
Long-term debt including current portion	116.4us-gaap_LongTermDebt	46.9us-gaap_LongTermDebt
Senior secured leverage ratio	0.7amed_SeniorSecuredLeverageRatio
Term Loan [Member]
Debt Instrument [Line Items]
Term loan, period	5 years
Weighted-average interest rate for five year Term Loan	3.40%	2.80%
Principal amount	60.0
Credit facility, maximum borrowing capacity			60.0
Maturity date	Oct. 26, 2017
Debt instrument, number of quarterly installments			20
Debt Instrument Periodic Payment Principal	3.0
Long-term debt including current portion	33.0	45.0
Revolving Credit Facilities [Member]
Debt Instrument [Line Items]
Principal amount	120.0
Availability under the revolving credit facility	85.7
Outstanding letters of credit	19.3
Amount of Revolving Credit Facility			165.0	120.0
Maturity date	Oct. 26, 2017
Long-term debt including current portion	15.0	0
Debt Weighted Average Interest Rate	3.40%
Second Lien Credit Agreement Term Loan [Member]
Debt Instrument [Line Items]
Principal amount	70.0
Maturity date	Jul. 28, 2020
Long-term debt including current portion	70.0	0
Proceeds From Issuance Of Debt	68.3
Promissory Notes [Member]
Debt Instrument [Line Items]
Long-term debt including current portion	0	1.9
Credit Agreement [Member]
Debt Instrument [Line Items]
Deferred debt issuance cost	0.7
Credit facility, additional interest rate over Federal Funds rate	0.50%
Credit Facility, additional interest rate over Eurodollar Rate	1.00%
Credit Facility, applicable margin on Base Rate Advances	1.75%
Credit Facility, applicable margin on Eurodollar Rate Advances	2.75%
Credit Agreement [Member] \| One Month [Member]
Debt Instrument [Line Items]
Eurodollar deposits interest period	1 month
Credit Agreement [Member] \| Two Month [Member]
Debt Instrument [Line Items]
Eurodollar deposits interest period	2 months
Credit Agreement [Member] \| Three Month [Member]
Debt Instrument [Line Items]
Eurodollar deposits interest period	3 months
Credit Agreement [Member] \| Six Month [Member]
Debt Instrument [Line Items]
Eurodollar deposits interest period	6 months
Second Lien Credit Agreement Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Deferred debt issuance cost	1.1
Credit facility, additional interest rate over Federal Funds rate	0.50%
Credit Facility, additional interest rate over Eurodollar Rate	7.50%
Credit Facility, additional interest rate over ABR Rate	6.50%
Credit Facility, ABR Flat Rate	2.00%
Credit Facility, additional interest rate over One Month Eurodollar Rate	1.00%
Credit Facility, LIBOR floor	1.00%
Debt Weighted Average Interest Rate	8.50%
Second Lien Credit Agreement Revolving Credit Facility [Member] \| Arranger Fee [Member]
Debt Instrument [Line Items]
Deferred debt issuance cost	$ 0.7
Second Lien Credit Agreement Revolving Credit Facility [Member] \| One Month [Member]
Debt Instrument [Line Items]
Eurodollar deposits interest period	1 month
Second Lien Credit Agreement Revolving Credit Facility [Member] \| Two Month [Member]
Debt Instrument [Line Items]
Eurodollar deposits interest period	2 months
Second Lien Credit Agreement Revolving Credit Facility [Member] \| Three Month [Member]
Debt Instrument [Line Items]
Eurodollar deposits interest period	3 months
Second Lien Credit Agreement Revolving Credit Facility [Member] \| Six Month [Member]
Debt Instrument [Line Items]
Eurodollar deposits interest period	6 months
Second Lien Credit Agreement Revolving Credit Facility [Member] \| One Year [Member]
Debt Instrument [Line Items]
Prepayment penalty percentage	2.00%
Second Lien Credit Agreement Revolving Credit Facility [Member] \| Two Year [Member]
Debt Instrument [Line Items]
Prepayment penalty percentage	1.00%