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Revenue Recognition and Reserve for Sales Returns and Allowances (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Significant Accounting Policies [Line Items]    
Reserve for sales returns and allowances $ 32,312 $ 38,365
Minimum    
Significant Accounting Policies [Line Items]    
Discount on invoiced amount of products 1.00%  
Maximum    
Significant Accounting Policies [Line Items]    
Discount on invoiced amount of products 20.00%