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Revenue Recognition - Summary of Impact of Adopting Topic 606 on Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Revenue from Contract with Customers [Line Items] |  |
Inventories | $ 51,491 | $ 48,346
Other current assets | 32,836 | 33,308
Total assets | 863,106 | 738,746
Deferred income taxes | 7,758 | 6,444
Retained earnings | 88,736 | 48,434
Total liabilities and stockholders' equity | 863,106 | $ 738,746
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |
Revenue from Contract with Customers [Line Items] |  |
Inventories | 7,003 |
Other current assets | (10,689) |
Total assets | (3,686) |
Deferred income taxes | (921) |
Retained earnings | (2,765) |
Total liabilities and stockholders' equity | (3,686) |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |
Revenue from Contract with Customers [Line Items] |  |
Inventories | 58,494 |
Other current assets | 22,147 |
Total assets | 859,420 |
Deferred income taxes | 6,837 |
Retained earnings | 85,971 |
Total liabilities and stockholders' equity | $ 859,420 |

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