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Accounts Receivable - Schedule of Accounts Receivable, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Receivables [Abstract]    
Gross accounts receivable $ 1,149,989 $ 997,682
Allowance for contractual adjustments and uncollectibles (822,579) (712,285)
Accounts receivable, net $ 327,410 $ 285,397