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Accrued Professional Liabilities - Schedule of Accrued Professional Liability (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]      
Balance at beginning of year $ 174,803 $ 151,397 $ 128,799
Liabilities recognized, offset by insurance Receivable (2,299) 3,922 10,354
Provision (adjustment) for losses related to Current year 56,016 45,674 42,733
Provision (adjustment) for losses related to Prior years (14,231) (1,551) (7,766)
Total provision for losses 41,785 44,123 34,967
Claim payments related to Current year (59) (59) (33)
Claim payments related to Prior years (24,103) (24,580) (22,690)
Total payments (24,162) (24,639) (22,723)
Balance at end of year $ 190,127 $ 174,803 $ 151,397