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Acquisitions - Schedule of Intangible Assets Acquired (Parenthetical) (Detail)	Jan. 12, 2018	Apr. 25, 2017	Apr. 13, 2017
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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Intangible Assets Estimated Useful Lives

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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

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