Accrued Professional Liabilities - Schedule of Accrued Professional Liability (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Payables and Accruals [Abstract]
Balance at beginning of year	$ 199,561	$ 190,127	$ 174,803
Liabilities recognized, offset by insurance receivable	(5,510)	(2,692)	(2,299)
Provision (adjustment) for losses related to Current year	55,144	53,180	56,016
Provision (adjustment) for losses related to Prior years	(7,551)	(4,056)	(14,231)
Total provision for losses	47,593	49,124	41,785
Claim payments related to Current year	(97)	(73)	(59)
Claim payments related to Prior years	(38,951)	(36,925)	(24,103)
Total payments	(39,048)	(36,998)	(24,162)
Balance at end of year	$ 202,596	$ 199,561	$ 190,127