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Accounts Receivable and Net Revenue - Schedule of Net Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Abstract]
Net revenue	$ 446,753	$ 441,245
Net patient service revenue [Member]
Disaggregation of Revenue [Abstract]
Net revenue	381,063	384,436
Hospital contract administrative fees [Member]
Disaggregation of Revenue [Abstract]
Net revenue	57,066	51,843
Other revenue [Member]
Disaggregation of Revenue [Abstract]
Net revenue	$ 8,624	$ 4,966

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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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