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Business Acquisitions - Summary of Company's Preliminary Allocation of Purchase Price (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Business Acquisition [Line Items] |  |
Goodwill | $ 4,283,963 | $ 3,845,157
Physician Group [Member] |  |
Business Acquisition [Line Items] |  |
Current assets | 43,550 |
Property and equipment | 5,281 |
Other noncurrent assets | 52,611 |
Goodwill | 439,822 |
Other intangible assets | 39,414 |
Current liabilities | (5,674) |
Other long-term liabilities | (21,086) |
Total assets and liabilities | $ 553,918 |

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