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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 905,375 | $ 888,675 | $ 868,309 | $ 851,183 | $ 888,436 | $ 848,759 | $ 864,987 | $ 852,628 | $ 3,513,542 | $ 3,454,810 | $ 3,253,391
Net patient service revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 3,091,987 | 3,067,784 | 2,915,648
Hospital contract administrative fees [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 396,814 | 363,368 | 315,778
Other revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | $ 24,741 | $ 23,658 | $ 21,965

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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