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Accounts Receivable and Net Revenue - Schedule of Net Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 932,696 | $ 896,652 | $ 915,918 | $ 901,857 | $ 910,820 | $ 868,951 | $ 842,944 | $ 835,597 | $ 3,647,123 | $ 3,458,312 | $ 3,183,159
Net patient service revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 3,067,784 | 2,915,648 | 2,760,192
Hospital contract administrative fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 363,369 | 315,778 | 271,886
Management Services [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | $ 215,970 | $ 226,886 | $ 151,081

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