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Revenue Recognition and Reserve for Sales Returns and Allowances - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Significant Accounting Policies [Line Items] |  |
Reserve for sales returns and allowances | $ 15,343 | $ 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% |

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- Details
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- Details
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