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Schedule II - Valuation and Qualifying Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Valuation Allowance on Deferred Tax Asset [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 27,497 $ 26,475 $ 25,267
Additions Charged to Costs and Expenses    (44)   
Additions Charged to Other Accounts    1,066 1,208
Deductions & Write-offs (395)      
Balance at End of Year 27,102 27,497 26,475
Valuation Allowance for Doubtful Accounts and Sales Returns [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 2,879 2,516 2,557
Additions Charged to Costs and Expenses 2,564 3,452 3,390
Additions Charged to Other Accounts (98)      
Deductions & Write-offs 2,594 3,089 3,431
Balance at End of Year $ 2,751 $ 2,879 $ 2,516