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Components of Valuation and Qualifying Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance For Doubtful Accounts And Unbilled Services
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of period $ 80,096 $ 63,205 $ 59,328
Charged to Expense 14,179 12,586 10,720
Charged to Other Accounts 13,054 [1] 18,607 [1] 9,621 [1]
Deductions 13,281 [2] 14,302 [2] 16,464 [2]
Balance at End of Period 94,048 80,096 63,205
Valuation Allowance of Deferred Tax Assets
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of period 886    
Charged to Expense 1,053 886  
Balance at End of Period $ 1,939 $ 886  
[1] Includes estimated provision for unbilled services recorded as a reduction to revenues (i.e., fee, rate and other adjustments).
[2] Includes estimated direct write-offs of uncollectible and unrealizable accounts receivable.