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Valuation and Qualifying Accounts (Detail) (Allowance for Doubtful Accounts, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 3,513 $ 4,887 $ 5,114
Charged to Costs and Expenses 0 1,100 0
Deductions 161 [1] (2,474) [1] (227) [1]
Ending Balance $ 3,674 $ 3,513 $ 4,887
[1] Consists of uncollectible accounts (written off) or recovered.