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Contingencies - Additional Information (Detail) $ in Thousands, R$ in Millions | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 22, 2011 USD ($) | Nov. 22, 2011 BRL (R$) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 BRL (R$) | Dec. 31, 2017 USD ($) | May 31, 2012 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Damages asserted by SVI | R$ |  |  |  | R$ 20.8 |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, contingent liability |  |  |  |  |  | $ 2,900
Chassis converter pool Liability, Current |  |  | $ 16,653 |  | $ 18,326 |
Supreme Industries Inc. [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Damages asserted by SVI |  |  | 40,000 |  |  |
Court-Imposed Interest, Fees or Inflation Adjustments |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Total ordered damages granted to Bk | $ 6,600 |  |  |  |  |
Court-Imposed Interest, Fees or Inflation Adjustments | Maximum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Total ordered damages granted to Bk | R$ |  | R$ 26.7 |  |  |  |
Chassis Converter Pool Agreements [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Other Inventory, Gross |  |  | $ 4,500 |  |  |

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