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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
Allowance for Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance, beginning of year $ 2,858 $ 2,861 $ 3,118
Provision 945 71 149
Write-offs, recoveries and discounts allowed (1,119) (91) (385)
Other 41 17 (21)
Balance, end of year 2,725 2,858 2,861
Allowance for Sales Discounts and Deductions [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance, beginning of year 2,302 2,831 2,845
Provision 5,526 3,661 4,080
Write-offs, recoveries and discounts allowed (6,148) (4,173) (4,070)
Other 130 (17) (24)
Balance, end of year $ 1,810 $ 2,302 $ 2,831