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Revenue Recognition - Summary of Impact of Adopting Topic 606 on Condensed Consolidated Statements of Operations and Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue from Contract with Customers [Line Items] |  |  |  |
Net revenue | $ 348,999 | $ 295,193 | $ 983,311 | $ 833,058
Cost of sales | 251,665 | 209,612 | 710,358 | 590,377
Income before income taxes | 20,921 | 17,731 | 51,034 | 45,849
Income tax provision | 5,358 | 5,721 | 12,762 | 15,502
Net income | 15,563 | $ 12,010 | 38,272 | $ 30,347
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] |  |  |  |
Net revenue | 60 |  | (2,612) |
Cost of sales | (207) |  | (1,781) |
Income before income taxes | 267 |  | (831) |
Income tax provision | 68 |  | (208) |
Net income | 199 |  | (623) |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Net revenue | 349,059 |  | 980,699 |
Cost of sales | 251,458 |  | 708,577 |
Income before income taxes | 21,188 |  | 50,203 |
Income tax provision | 5,426 |  | 12,554 |
Net income | $ 15,762 |  | $ 37,649 |

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