| **Summary of Significant Accounting Policies - Table 2 (Details)**                     | Dec. 31, 2012 | Dec. 31, 2011 |
|----------------------------------------------------------------------------------------|---------------|---------------|
| **Concentration Of Net Patient Service Accounts Receivable By Payor Class [Abstract]** |          |          |
| Medicare                                                                               | 62.80%        | 60.70%        |
| Medicaid                                                                               | 2.10%         | 2.60%         |
| Workers' compensation                                                                  | 3.00%         | 3.20%         |
| Managed care and other discount plans                                                  | 25.80%        | 26.80%        |
| Other third-party payors                                                               | 4.30%         | 4.70%         |
| Patients                                                                               | 2.00%         | 2.00%         |
| Total                                                                                  | 100.00%       | 100.00%       |

| X                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of Net Patient Service Accounts Receivable Total.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage Of Total Net Patient Service Accounts Receivable Managed Care And Other Discount Plans.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage Of Total Net Patient Service Accounts Receivable Medicaid.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage Of Total Net Patient Service Accounts Receivable Medicare.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage Of Total Net Patient Service Accounts Receivable Other Third Party Payors.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage Of Total Net Patient Service Accounts Receivable Patients.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage Of Total Net Patient Service Accounts Receivable Workers Compensation.
+ References
No definition available.
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