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Revenue from Contracts with Customers - Condensed Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Other current assets | $ 24,494 |  | $ 24,494 |  | $ 18,518
Net sales | 196,349 | $ 157,947 | 365,497 | $ 315,502 |
Cost of sales | 148,640 | 114,514 | 275,084 | 228,994 |
Income from operations | (292) | $ 12,642 | 3,401 | $ 26,494 |
Balances Without Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Net sales | 196,367 |  | 365,569 |  |
Cost of sales | 148,631 |  | 275,120 |  |
Income from operations | (265) |  | 3,437 |  |
Effect of Change [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Net sales | (18) |  | (72) |  |
Cost of sales | 9 |  | (36) |  |
Income from operations | $ (27) |  | $ (36) |  |

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