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Accounts Receivable - Schedule of Accounts Receivable, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Receivables [Abstract]    
Gross accounts receivable $ 946,892 $ 872,962
Allowance for contractual adjustments and uncollectibles (674,078) (624,896)
Accounts Receivable - Total $ 272,814 $ 248,066