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Valuation and Qualifying Accounts and Reserves (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for uncollectible accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 29,458 $ 33,291 $ 36,794
Charged to Expense 8,315 12,290 14,631
Deductions 8,741 16,123 18,134
Balance at End of Year 29,032 29,458 33,291
Valuation allowance for deferred tax assets [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 81,464 57,607 58,322
Charged to Expense 4,989 23,857 0
Deductions 0 0 715
Balance at End of Year $ 86,453 $ 81,464 $ 57,607