Acquisition (Policies)	3 Months Ended
Acquisition (Policies)	Mar. 31, 2014
Accounting Policies [Abstract]
Acquisition and Investments in Unconsolidated Affiliates	As a significant part of its growth strategy, the Company primarily acquires controlling interests in centers. The Company accounts for its business combinations under the fundamental requirements of the acquisition method of accounting and under the premise that an acquirer be identified for each business combination. The acquirer is the entity that obtains control of one or more businesses in the business combination and the acquisition date is the date the acquirer achieves control. The assets acquired, liabilities assumed and any noncontrolling interests in the acquired business at the acquisition date are recognized at their fair values as of that date, and the direct costs incurred in connection with the business combination are recorded and expensed separately from the business combination. Acquisitions in which the Company is able to exert significant influence but does not have control are accounted for using the equity method. Equity method investments are initially recorded at cost, unless such investments are a result of the Company entering into a transaction whereby the Company loses control of a previously controlled entity but retains a noncontrolling interest. Such transactions, which result in the deconsolidation of a previously consolidated entity, are measured at fair value.

Disclosure of accounting policy for completed business combinations (purchase method, acquisition method or combination of entities under common control). This accounting policy may include a general discussion of the purchase method or acquisition method of accounting (including for example, the treatment accorded contingent consideration, the identification of assets and liabilities, the purchase price allocation process, how the fair values of acquired assets and liabilities are determined) and the entity's specific application thereof. An entity that acquires another entity in a leveraged buyout transaction generally discloses the accounting policy followed by the acquiring entity in determining the basis used to value its interest in the acquired entity, and the rationale for that accounting policy.

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