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Revenue from Contracts with Customers - Condensed Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Net sales | $ 205,683 | $ 148,156 | $ 571,180 | $ 463,658
Cost of sales | 156,408 | 111,272 | 431,492 | 340,266
Income (loss) from operations | 5,881 | $ 5,551 | 9,283 | $ 32,045
Balances Without Adoption of ASC 606 | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Net sales | 205,691 |  | 571,260 |
Cost of sales | 156,424 |  | 431,544 |
Income (loss) from operations | 5,873 |  | 9,311 |
Effect of Change | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Net sales | (8) |  | (80) |
Cost of sales | (16) |  | (52) |
Income (loss) from operations | $ 8 |  | $ (28) |

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