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Liability for Warranty Returns - Summary of Warranty Expense and Write-Off Activity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Product Warranties Disclosures [Abstract] |  |  |  |
Balance at beginning of period | $ 9,687 | $ 8,988 | $ 9,724 | $ 8,548
Plus: Amounts charged to cost and expenses | 4,860 | 3,055 | 6,683 | 2,314
Less: Deductions | (4,436) | (2,863) | (6,296) | (1,682)
Balance at end of period | $ 10,111 | $ 9,180 | $ 10,111 | $ 9,180

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