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Accrued Professional Liability - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Payables and Accruals [Abstract]        
Total accrued professional liability $ 202,527 $ 168,369 $ 158,691 $ 137,036
Accrued professional liability incurred but loss reserves not reported for claims 142,400 120,600    
Accrued professional liability incurred and loss reserves reported for claims $ 60,100 $ 47,800