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Acquisitions - Summary of Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 2,199,937 | $ 2,105,264 | $ 2,085,104
CenterPointe Behavioral Health System, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash | 5,640 |  |
Accounts receivable, net | 10,230 |  |
Other current assets | 2,087 |  |
Property and equipment | 35,670 |  |
Goodwill | 97,122 |  |
Intangible assets | 825 |  |
Deferred tax assets | 1,573 |  |
Operating lease right-of-use assets | 28,858 |  |
Total assets acquired | 182,005 |  |
Accounts payable | 3,820 |  |
Accrued salaries and benefits | 3,585 |  |
Current portion of operating lease liabilities | 2,582 |  |
Other accrued liabilities | 1,088 |  |
Operating lease liabilities | 26,275 |  |
Total liabilities assumed | 37,350 |  |
Net assets acquired | $ 144,655 |  |

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