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Accrued Professional Liabilities - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Payables and Accruals [Abstract]        
Total accrued professional liability $ 202,052 $ 202,527 $ 168,369 $ 158,691
Accrued professional liability incurred but loss reserves not reported for claims 128,100 135,100    
Accrued professional liability incurred and loss reserves reported for claims $ 74,000 $ 67,400