Number of shares authorized for issuance to the Company's employee stock purchase plan

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Fair value of a share of common stock, percentage

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Number of stock units authorized for exceeding targeted performance

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Number of stock units authorized for achievement of targeted performance

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Percentage of ownership in subsidiaries

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Percentage of total combined voting power of the Company and our subsidiaries

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of plan compensation cost recognized during the period.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Discount rate from fair value on purchase date that participants pay for shares.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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Capital Stock and Share-Based Compensation (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 07, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Stock Shares Authorized	60,000,000us-gaap_CommonStockSharesAuthorized	60,000,000us-gaap_CommonStockSharesAuthorized
Common Stock Par Or Stated Value Per Share	$ 0.001	$ 0.001
Preferred Stock Shares Authorized	5,000,000us-gaap_PreferredStockSharesAuthorized	5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock Par Or Stated Value Per Share	$ 0.001	$ 0.001
Common Stock Shares Issued	34,569,526us-gaap_CommonStockSharesIssued	33,413,970us-gaap_CommonStockSharesIssued
Common Stock Shares Outstanding	33,594,572us-gaap_CommonStockSharesOutstanding	32,538,971us-gaap_CommonStockSharesOutstanding
Preferred Stock Shares Issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred Stock Shares Outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Percentage of Ownership in Subsidiaries	50.00%
Equity-based Awards, Maximum Number of Shares Granted	4,000,000
Equity-based Awards, Shares Available for Grant	1,300,000
Percentage of Total Combined Voting Power of the Ccompany and Our Subsidiaries	10.00%
Percentage of Market Value at Which Eligible Employees May Purchase Shares of Common Stock	85.00%
Common Stock Shares Authorized For Issuance To Employee Stock Purchase Plan	1,600,472
Employee Stock Purchase Plan expense	$ 0.4	$ 0.5	$ 0.7
Intrinsic Value of Stock Options Outstanding	0.8
Intrinsic Value of Stock Options Exerciseable	0.2
Intrinsic Value of Stock Options Exercised	0.1	0.2	0.1
Unrecognized compensation expense related to non-vested stock awards	3.3
Non-vested stock award compensation expense weighted-average period, years	2 years 6 months
Market-based award, target number of shares to be received		417,330amed_MarketBasedAwardTargetShareAmount
Market-based award, maximum number of shares authorized to be received		667,728amed_MarketBasedAwardMaximumShareAmount
Share-Based Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair Value of Share of Common Stock, Percentage	100.00%
Share Based Awards To More Than Ten Percent Owner [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair Value of Share of Common Stock, Percentage	110.00%
Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Compensation Expense	0.1
Non-Vested Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Compensation Expense	4.6	5.2	6.4
Non-vested Stock Granted, Weighted Average Grant Date Fair Value	$ 16.38	$ 10.91	$ 14.01
Unrecognized compensation expense related to non-vested stock awards	8.7
Non-vested stock award compensation expense weighted-average period, years	1 year 9 months 18 days
Non-Vested Stock Units - Service-Based and Performance-Based [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Compensation Expense			0.1
Non-vested Stock Granted, Weighted Average Grant Date Fair Value			$ 56.99
Non-Vested Stock Units - Service-Based and Market-Based [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Compensation Expense	0.5	0.8
Non-vested Stock Granted, Weighted Average Grant Date Fair Value	$ 0
Unrecognized compensation expense related to non-vested stock awards	$ 1.1
Non-vested stock award compensation expense weighted-average period, years	1 year 2 months 12 days
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting Period of Equity-based Awards	12 months
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting Period of Equity-based Awards	5 years
Contractual Term of Stock Options Exercised	ten
Common Stock Shares Authorized For Issuance To Employee Stock Purchase Plan		4,500,000		2,500,000