Revenue Recognition (Policies)	3 Months Ended
Revenue Recognition (Policies)	Mar. 31, 2014
Accounting Policies [Abstract]
Revenue Recognition	Center revenues consist of billing for the use of the centers’ facilities directly to the patient or third-party payor and, at certain of the Company’s centers (primarily centers that perform gastrointestinal endoscopy procedures), billing for anesthesia services provided by medical professionals employed or contracted by the Company’s centers. Such revenues are recognized when the related surgical procedures are performed. Revenues exclude any amounts billed for physicians’ surgical services, which are billed separately by the physicians to the patient or third-party payor. Revenues from centers are recognized on the date of service, net of estimated contractual adjustments from third-party medical service payors including Medicare and Medicaid. During each of the three months ended March 31, 2014 and 2013, the Company derived approximately 25% of its revenues from governmental healthcare programs, primarily Medicare and managed Medicare programs. Concentration of credit risk with respect to other payors is limited due to the large number of such payors.

Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.

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