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Summarizes Activity of the Product Revenue Allowance and Reserve Categories (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]  
Balance at January 1, 2013   
Provision related to current period and deferred sales 11,646
Credits/payments made for current period and deferred sales (9,177)
Balance at December 31, 2013 2,469
Allowance for Trade Receivables
  
Valuation and Qualifying Accounts Disclosure [Line Items]  
Balance at January 1, 2013   
Provision related to current period and deferred sales 4,178
Credits/payments made for current period and deferred sales (3,107)
Balance at December 31, 2013 1,071
Rebates Chargebacks And Discounts
  
Valuation and Qualifying Accounts Disclosure [Line Items]  
Balance at January 1, 2013   
Provision related to current period and deferred sales 4,282
Credits/payments made for current period and deferred sales (3,145)
Balance at December 31, 2013 1,137
Allowance for Sales Returns
  
Valuation and Qualifying Accounts Disclosure [Line Items]  
Balance at January 1, 2013   
Provision related to current period and deferred sales 72
Balance at December 31, 2013 72
Other Incentive Programs
  
Valuation and Qualifying Accounts Disclosure [Line Items]  
Balance at January 1, 2013   
Provision related to current period and deferred sales 3,114
Credits/payments made for current period and deferred sales (2,925)
Balance at December 31, 2013 $ 189