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Revenue Recognition - Summary of Impact of Adopting Topic 606 on Consolidated Statements of Operations and Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue from Contract with Customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 353,121 | $ 348,999 | $ 332,584 | $ 301,728 | $ 299,869 | $ 295,193 | $ 282,196 | $ 255,669 | $ 1,336,432 | $ 1,132,927 | $ 862,980
Cost of sales |  |  |  |  |  |  |  |  | 964,841 | 808,901 | 610,532
Income before income taxes |  |  |  |  |  |  |  |  | 72,186 | 55,820 | 59,610
Income tax provision |  |  |  |  |  |  |  |  | 17,438 | 14,680 | 21,174
Net income | $ 16,476 | $ 15,563 | $ 16,315 | $ 6,394 | $ 10,793 | $ 12,010 | $ 11,973 | $ 6,364 | 54,748 | $ 41,140 | $ 38,436
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 |  |  |  |  |  |  |  |  | (751) |  |
Cost of sales |  |  |  |  |  |  |  |  | (578) |  |
Income before income taxes |  |  |  |  |  |  |  |  | (173) |  |
Income tax provision |  |  |  |  |  |  |  |  | (43) |  |
Net income |  |  |  |  |  |  |  |  | (130) |  |
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 |  |  |  |  |  |  |  |  | 1,335,681 |  |
Cost of sales |  |  |  |  |  |  |  |  | 964,263 |  |
Income before income taxes |  |  |  |  |  |  |  |  | 72,013 |  |
Income tax provision |  |  |  |  |  |  |  |  | 17,395 |  |
Net income |  |  |  |  |  |  |  |  | $ 54,618 |  |

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