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Accounts Receivable - Schedule of Accounts Receivable, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Receivables [Abstract]    
Gross accounts receivable $ 921,461 $ 872,962
Allowance for contractual adjustments and uncollectibles (651,687) (624,896)
Accounts Receivable - Total $ 269,774 $ 248,066