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Acquisition of supreme industries, Inc.- Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 27, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Business Combination, Acquisition Related Costs |  | $ 0 | $ 8,704 | $ 68 | $ 8,704 |  |
Goodwill |  | 311,044 | 313,626 | 311,044 | 313,626 | $ 317,464 | $ 148,367
Goodwill, Period Increase (Decrease) |  |  |  | 1,500 |  |  |
Revenues |  | 553,073 | $ 425,098 | 1,657,082 | 1,223,717 |  |
Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 325,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.50% |  |  |  |  |  |
Supreme Industries Inc. [Member] |  |  |  |  |  |  |
Business Acquisition, Share Price | $ 21 |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  | 100 | $ 8,700 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 161,200 |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  |  |  |  |  | 20,100 |
Finite-Lived Intangible Assets, Amortization Expense, Year Two |  |  |  |  |  | 20,500 |
Finite-Lived Intangible Assets, Amortization Expense, Year Three |  |  |  |  |  | 22,100 |
Finite-Lived Intangible Assets, Amortization Expense, Year Four |  |  |  |  |  | 23,400 |
Finite-Lived Intangible Assets, Amortization Expense, Year Five |  |  |  |  |  | $ 18,900 |
Goodwill | 167,714 |  |  |  |  |  |
Revenues |  | 85,100 |  | 276,800 |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  | $ 200 |  | $ 14,200 |  |  |
Class A and Class B [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 360,400 |  |  |  |  |  |
Class A and Class B [Member] | Supreme Industries Inc. [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 360,400 |  |  |  |  |  |

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