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Accounts Receivable and Net Revenue - Schedule of Net Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Abstract] |  |  |  |
Net revenue | $ 868,309 | $ 864,987 | $ 1,719,492 | $ 1,717,615
Net patient service revenue |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Net revenue | 765,525 | 763,667 | 1,515,110 | 1,520,040
Hospital contract administrative fees |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Net revenue | 96,741 | 95,534 | 191,462 | 186,773
Other revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Net revenue | $ 6,043 | $ 5,786 | $ 12,920 | $ 10,802

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