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Accounts Receivable - Schedule of Accounts Receivable, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Receivables [Abstract]    
Gross accounts receivable $ 1,202,549 $ 997,682
Allowance for contractual adjustments and uncollectibles (857,380) (712,285)
Accounts receivable, net $ 345,169 $ 285,397