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Business Acquisitions - Additional Information (Detail) (USD $)
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3 Months Ended |
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Mar. 31, 2015
Company
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Mar. 31, 2014
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Dec. 31, 2014
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| Business Acquisition [Line Items] |
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| Number of physician group practices acquired |
3 |
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| Business acquisition, total consideration |
$ 37,100,000 |
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| Goodwill |
2,813,673,000 |
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2,776,188,000 |
| Other intangible assets |
4,800,000 |
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| Other liabilities |
1,300,000 |
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| Contingent consideration payments related to prior-period acquisitions |
400,000 |
3,400,000 |
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| Goodwill deductible for tax purposes |
10,800,000 |
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| Three Physician Group Practices Acquisition [Member] |
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| Business Acquisition [Line Items] |
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| Goodwill |
33,600,000 |
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| Prior-Period Acquisitions [Member] |
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| Business Acquisition [Line Items] |
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| Goodwill |
3,900,000 |
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| Other intangible assets |
5,300,000 |
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| Other liabilities |
2,000,000 |
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| Additional cash consideration related to a working capital |
$ 600,000 |
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