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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2014
Accounting Policies [Line Items] |  |  |  |  |
Prepaid Expense, Current |  | $ 24,400 | $ 8,400 |  |
Disposal Group, Including Discontinued Operation, Assets |  | 5,800 |  |  |
General And Administrative Expenses Cost Of Goods Sold Depreciation |  | 15,900 | 16,000 | $ 16,500 |
Capital Leases, Balance Sheet, Assets by Major Class, Net |  | 4,300 | 5,000 |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation |  | 1,900 | 2,600 |  |
Amortization Of Intangible Assets |  | 19,940 | 21,259 | 21,878 |
Estimated amortization expense for 2017 |  | 16,900 |  |  |
Estimated amortization expense for 2018 |  | 15,400 |  |  |
Estimated amortization expense for 2019 |  | 14,500 |  |  |
Estimated amortization expense for 2020 |  | 13,700 |  |  |
Estimated amortization expense for 2021 |  | 12,000 |  |  |
Impairment of goodwill | $ 1,700 | 1,663 | 1,087 |  |
Capitalized Computer Software, Net |  | 5,400 | 2,700 |  |
Research and Development Expense |  | 6,400 | 4,800 | 1,700 |
Capitalized Computer Software, Amortization |  | 1,000 | 700 | 500 |
Retail |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Goodwill |  |  |  |  | $ 500
Commercial Trailer Products |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Impairment of goodwill | $ 1,700 |  |  |  |
Goodwill, Period Increase (Decrease) |  | 2,600 | 2,600 |  |
Used Trailers |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Accounts Payable, Trade |  |  | 2,100 |  |
Property, Plant and Equipment, Additions |  | 4,600 | 12,800 | $ 26,800 |
Property Plant And Equipment Net Realizable Value |  | $ 0 | $ 10,000 |  |
Building and Building Improvements |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 33 years |  |  |

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