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Summary of Significant Accounting Policies - Schedule of Percentage of Total Net Patient Service Accounts Receivable (Detail)
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Dec. 31, 2014
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Dec. 31, 2013
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| Significant Acquisitions And Disposals [Line Items] |
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| Percentage of total net patient service accounts receivable |
100.00% |
100.00% |
| Commercial Health Insurance Payors [Member] |
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| Significant Acquisitions And Disposals [Line Items] |
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| Percentage of total net patient service accounts receivable |
59.00% |
59.00% |
| Medicare [Member] |
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| Significant Acquisitions And Disposals [Line Items] |
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| Percentage of total net patient service accounts receivable |
14.00% |
14.00% |
| Workers' Compensation [Member] |
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| Significant Acquisitions And Disposals [Line Items] |
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| Percentage of total net patient service accounts receivable |
14.00% |
13.00% |
| Medicaid [Member] |
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| Significant Acquisitions And Disposals [Line Items] |
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| Percentage of total net patient service accounts receivable |
3.00% |
3.00% |
| Patients and Other Third-Party Payors [Member] |
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| Significant Acquisitions And Disposals [Line Items] |
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| Percentage of total net patient service accounts receivable |
10.00% |
11.00% |