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Valuation and Qualifying Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance Beginning of Year $ 5,034 $ 5,413 $ 6,348
Charged to Expenses 32,088 30,152 26,070
Deductions (31,769) (30,531) (27,005)
Balance End of Year 5,353 5,034 5,413
Allowance for Doubtful Accounts
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance Beginning of Year 1,906 2,493 3,909
Charged to Expenses 1,043 143 (937)
Deductions (1,040) [1] (730) [1] (479) [1]
Balance End of Year 1,909 1,906 2,493
Reserve for Customer Deductions
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance Beginning of Year 3,128 2,920 2,439
Charged to Expenses 31,045 30,009 27,007
Deductions (30,729) [2] (29,801) [2] (26,526) [2]
Balance End of Year $ 3,444 $ 3,128 $ 2,920
[1] Consists primarily of uncollectable accounts written off, net of recoveries, during the year.
[2] Consists primarily of discounts taken by customers during the year.