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Revenue Recognition and Reserve for Sales Returns and Allowances - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Minimum
Mar. 31, 2013
Maximum
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]        
Discount on invoiced amount of products     1.00% 6.00%
Reserve for sales returns and allowances $ 30,725 $ 34,373 [1]    
[1] Derived from audited financial statements