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Accounts Receivable and Net Revenue - Schedule of Net Patient Service Revenue by Type of Payor (Detail) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of net patient service revenue | 100.00% | 100.00% | 100.00% | 100.00%
Contracted Managed Care [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of net patient service revenue | 71.00% | 71.00% | 70.00% | 71.00%
Government [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of net patient service revenue | 23.00% | 23.00% | 24.00% | 24.00%
Other Third-Parties [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of net patient service revenue | 4.00% | 4.00% | 4.00% | 3.00%
Private-Pay Patients [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of net patient service revenue | 2.00% | 2.00% | 2.00% | 2.00%

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