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Revenue Recognition and Reserve for Sales Returns and Allowances - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Minimum
Jun. 30, 2012
Maximum
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]        
Discount on invoiced amount of products     1.00% 6.00%
Reserve for sales returns and allowances $ 26,007 $ 43,440 [1]    
[1] Derived from audited financial statements