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Accrued Professional Liability (Narrative) (Detail) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Malpractice Loss Contingency [Line Items]        
Total accrued professional liability $ 137,036,000 $ 122,847,000 $ 111,662,000 $ 109,628,000
Accrued professional liability incurred but loss reserves not reported for claims 90,600,000 79,500,000    
Accrued professional liability incurred and loss reserves reported for claims $ 46,400,000 $ 43,300,000