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Valuation and Qualifying Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 3,996 $ 4,602 $ 12,611
Additions Due to acquisitions   246  
Additions Charged to costs and expenses 6,264 6,841 3,441
Deductions (5,051) (7,693) (11,450)
Balance at end of period 5,209 3,996 4,602
Allowance for Doubtful Accounts
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 361 328 1,057
Additions Due to acquisitions   67  
Additions Charged to costs and expenses 260 181 63
Deductions (148) [1] (215) [1] (792) [1]
Balance at end of period 473 361 328
Allowance for Sales Returns
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 3,635 4,274 11,554
Additions Due to acquisitions   179  
Additions Charged to costs and expenses 6,004 [2] 6,660 [2] 3,378 [2]
Deductions (4,903) [3] (7,478) [3] (10,658) [3]
Balance at end of period $ 4,736 $ 3,635 $ 4,274
[1] Uncollectible accounts written off, net of recoveries.
[2] Charged to net sales.
[3] Allowances granted.