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Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Detail) (Allowance for Doubtful Accounts Receivable [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts Receivable [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 8,657 $ 11,706 $ 30,112
Charged to Expense 19,897 18,012 34,364
Deductions (18,876) (21,061) (52,770)
Balance at End of Year $ 9,678 $ 8,657 $ 11,706