Revenue Recognition and Reserve for Sales Returns and Allowances - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	[1]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Reserve for sales returns and allowances	$ 16,379	$ 17,267
Minimum
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Discount on invoiced amount of products	1.00%
Maximum
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Discount on invoiced amount of products	10.00%

[1] Derived from audited financial statements