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Accounts Receivable and Net Revenue - Schedule of Net Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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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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.

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-Name Accounting Standards Codification
-Topic 606
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