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Accounts Receivable and Net Revenue - Schedule of Net Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Abstract]
Net revenue	$ 492,949	$ 460,635	$ 1,412,661	$ 1,317,321
Net patient service revenue [Member]
Disaggregation of Revenue [Abstract]
Net revenue	432,854	388,843	1,226,866	1,128,042
Hospital contract administrative fees [Member]
Disaggregation of Revenue [Abstract]
Net revenue	59,491	55,279	175,462	160,112
Other revenue [Member]
Disaggregation of Revenue [Abstract]
Net revenue	$ 604	$ 16,513	$ 10,333	$ 29,167

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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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