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Accounts Receivable and Net Revenue - Schedule of Net Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Abstract]
Net revenue	$ 482,229	$ 446,753
Net patient service revenue [Member]
Disaggregation of Revenue [Abstract]
Net revenue	406,035	381,063
Hospital contract administrative fees [Member]
Disaggregation of Revenue [Abstract]
Net revenue	63,526	57,066
Other revenue [Member]
Disaggregation of Revenue [Abstract]
Net revenue	$ 12,668	$ 8,624

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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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