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Valuation and Qualifying Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts Receivable
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 311,387 $ 253,405 [1] $ 248,622 [1]
Charges to costs and expenses 1,127,216 726,671 613,619 [1]
Acquisitions of business   5,632  
Write-off of uncollectible accounts (1,043,568) (674,321) (608,836) [1]
Balance at end of period 395,035 311,387 253,405 [1]
Valuation Allowance for Deferred Tax Assets
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 44,511 42,143 32,352
Charges to costs and expenses 2,330 2,368 10,904
Write-off of uncollectible accounts     (1,113)
Balance at end of period $ 46,841 $ 44,511 $ 42,143
[1] Included in the charges to costs and expenses in 2011 is $17.0 million related to facilities that were divested or recorded as held for sale during 2012.