| **Basis of Presentation (Policies)**                                                | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| **Organization, Consolidation and Presentation of Financial Statements [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Net Operating Revenues Policy                                                       | Net Operating Revenues—During the three and six months ended June 30, 2014 and 2013, we derived consolidated Net operating revenues from the following payor sources: Three Months Ended June 30, Six Months Ended June 30, 2014 2013 2014 2013Medicare74.1% 74.6% 74.7% 74.6%Medicaid1.8% 1.0% 1.5% 1.1%Workers’ compensation1.2% 1.2% 1.2% 1.3%Managed care and other discount plans, including Medicare Advantage18.7% 18.4% 18.4% 18.4%Other third-party payors1.7% 1.7% 1.6% 1.7%Patients0.9% 1.2% 1.0% 1.2%Other income1.6% 1.9% 1.6% 1.7%Total100.0% 100.0% 100.0% 100.0%See Note 1, Summary of Significant Accounting Policies, to the consolidated financial statements accompanying the 2013 Form 10-K for our policies related to Net operating revenues,Accounts receivable, and our Allowance for doubtful accounts. |

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| - Definition
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.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18726-107790Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section B -Paragraph Question 1Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.B.Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18823-107790
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