Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 215,734	$ 173,416
Gross Profit	31,121	21,503
Depreciation and Amortization Expense	3,813	3,916
Selling, General & Administrative Expenses	15,304	16,619
Operating Income	15,485	4,557
Capital and Other Expenditures [Abstract]
Capital Expenditures	1,765	4,687
Other Items		3,125
Operating Segments
Segment Reporting Information [Line Items]
Revenues	215,734	173,416
Corporate/ Other
Segment Reporting Information [Line Items]
Revenues	(3,735)	(2,178)
Gross Profit	(385)	(357)
Depreciation and Amortization Expense	669	630
Selling, General & Administrative Expenses	5,526	6,683
Operating Income	(5,911)	(7,041)
Capital and Other Expenditures [Abstract]
Capital Expenditures	120	259
Other Items		2,377
Global Truck & Bus
Segment Reporting Information [Line Items]
Revenues	128,304	102,089
Global Truck & Bus \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	127,492	101,864
Gross Profit	18,971	14,038
Depreciation and Amortization Expense	1,859	2,063
Selling, General & Administrative Expenses	5,512	5,453
Operating Income	13,162	8,293
Capital and Other Expenditures [Abstract]
Capital Expenditures	838	3,212
Other Items		640
Global Truck & Bus \| Intersegment Revenues
Segment Reporting Information [Line Items]
Revenues	812	225
Global Construction & Agriculture
Segment Reporting Information [Line Items]
Revenues	91,165	73,505
Global Construction & Agriculture \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	88,242	71,552
Gross Profit	12,535	7,822
Depreciation and Amortization Expense	1,285	1,223
Selling, General & Administrative Expenses	4,266	4,483
Operating Income	8,234	3,305
Capital and Other Expenditures [Abstract]
Capital Expenditures	807	1,216
Other Items		108
Global Construction & Agriculture \| Intersegment Revenues
Segment Reporting Information [Line Items]
Revenues	$ 2,923	$ 1,953

Capital Expenditures

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Capital and Other Expenditures [Abstract]

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No definition available.

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The net result for the period of deducting operating expenses from operating revenues.

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No definition available.

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Amount of general expenses not normally included in Other Operating Costs and Expenses.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311

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