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Revenue from Contracts with Customers - Condensed Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | $ 169,148 | $ 157,555
Cost of sales | 126,444 | 114,480
Income from operations | 3,693 | $ 13,852
Balances Without Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | 169,202 |
Cost of sales | 126,489 |
Income from operations | 3,702 |
Effect of Change [Member] | Accounting Standards Update 2014-09 [Member] |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net sales | (54) |
Cost of sales | (45) |
Income from operations | $ (9) |

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