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Revenue Recognition and Reserve for Sales Returns and Allowances - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Significant Accounting Policies [Line Items]    
Reserve for sales returns and allowances $ 21,335 $ 17,622
Minimum    
Significant Accounting Policies [Line Items]    
Discount on invoiced amount of products 2.00%  
Maximum    
Significant Accounting Policies [Line Items]    
Discount on invoiced amount of products 10.00%