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Accounts Receivable and Net Revenue - Schedule of Net Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Abstract] |  |
Net revenue | $ 851,183 | $ 852,628
Net patient service revenue |  |
Disaggregation of Revenue [Abstract] |  |
Net revenue | 749,585 | 756,374
Hospital contract administrative fees |  |
Disaggregation of Revenue [Abstract] |  |
Net revenue | 94,721 | 91,239
Other revenue [Member] |  |
Disaggregation of Revenue [Abstract] |  |
Net revenue | $ 6,877 | $ 5,015

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