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Accounts Receivable - Schedule of Accounts Receivable, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Receivables [Abstract]    
Gross accounts receivable $ 1,251,666us-gaap_AccountsReceivableGrossCurrent $ 1,200,958us-gaap_AccountsReceivableGrossCurrent
Allowance for contractual adjustments and uncollectibles (890,792)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (848,767)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net $ 360,874us-gaap_AccountsReceivableNetCurrent $ 352,191us-gaap_AccountsReceivableNetCurrent