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Acquisitions - Schedule of Intangible Assets Acquired (Parenthetical) (Detail) | Jan. 12, 2018 | Apr. 25, 2017 | Apr. 13, 2017
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Lance Camper Mfg. Corp. [Member] | Order Customer Relationships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired intangible assets, useful life | 6 years |  |
Lance Camper Mfg. Corp. [Member] | Order Backlog [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired intangible assets, useful life | 1 year |  |
Lance Camper Mfg. Corp. [Member] | Trade Names [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired indefinite intangible assets, useful life | indefinite life |  |
Ferrara Fire Apparatus, Inc. [Member] | Order Customer Relationships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired intangible assets, useful life |  | 12 years |
Ferrara Fire Apparatus, Inc. [Member] | Order Backlog [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired intangible assets, useful life |  | 1 year |
Ferrara Fire Apparatus, Inc. [Member] | Non-compete Agreements [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired intangible assets, useful life |  | 4 years |
Ferrara Fire Apparatus, Inc. [Member] | Trade Names [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired indefinite intangible assets, useful life |  | indefinite life |
Midwest Automotive Designs [Member] | Order Customer Relationships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired intangible assets, useful life |  |  | 6 years
Midwest Automotive Designs [Member] | Order Backlog [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired intangible assets, useful life |  |  | 1 year
Midwest Automotive Designs [Member] | Trade Names [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired indefinite intangible assets, useful life |  |  | indefinite life

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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