v2.4.0.8
Accounts Receivable - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, percentage of balances more than six months old 14.00% 17.00%
Percentage of outstanding patient accounts receivables to be reserved as per Company's policy 100.00%  
Account receivable outstanding, number of months 4 months  
Decrease in allowance for doubtful accounts $ (7,979) $ (5,221)
Government-based Programs, Medicare and Medicaid | Accounts Receivable
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of accounts receivable due 80.00%  
Health Care Patient | Accounts Receivable
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of accounts receivable due 1.00%