Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 195,127	$ 178,251	$ 368,543	$ 358,543
Gross Profit	22,701	24,331	44,204	50,036
Depreciation and Amortization Expense	3,887	3,998	7,803	8,409
Selling, General & Administrative Expenses	14,802	15,585	31,421	32,376
Operating Income	7,568	8,427	12,125	17,008
Capital and Other Expenditures [Abstract]
Capital Expenditures	3,156	2,951	7,843	5,236
Other Items	877	495	4,328	1,384
Operating Segments
Segment Reporting Information [Line Items]
Revenues	195,127	178,251	368,543	358,543
Corporate/ Other
Segment Reporting Information [Line Items]
Revenues	(2,964)	(2,400)	(5,141)	(4,380)
Gross Profit	(329)	(371)	(685)	(795)
Depreciation and Amortization Expense	749	472	1,379	1,328
Selling, General & Administrative Expenses	5,126	5,163	11,808	10,968
Operating Income	(5,454)	(5,534)	(12,494)	(11,762)
Capital and Other Expenditures [Abstract]
Capital Expenditures	1,060	380	1,319	573
Other Items	0	0	2,377	688
Global Truck & Bus
Segment Reporting Information [Line Items]
Revenues	119,910	112,126	221,998	228,630
Global Truck & Bus \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	119,603	111,883	221,466	228,167
Gross Profit	17,070	14,432	31,107	32,255
Depreciation and Amortization Expense	1,949	2,190	4,012	4,224
Selling, General & Administrative Expenses	5,701	5,642	11,154	12,137
Operating Income	11,073	8,506	19,366	19,535
Capital and Other Expenditures [Abstract]
Capital Expenditures	836	1,540	4,048	2,447
Other Items	3	284	968	375
Global Truck & Bus \| Intersegment Revenues
Segment Reporting Information [Line Items]
Revenues	307	243	532	463
Global Construction & Agriculture
Segment Reporting Information [Line Items]
Revenues	78,181	68,525	151,686	134,293
Global Construction & Agriculture \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	75,524	66,368	147,077	130,376
Gross Profit	5,960	10,270	13,782	18,576
Depreciation and Amortization Expense	1,189	1,336	2,412	2,857
Selling, General & Administrative Expenses	3,975	4,780	8,459	9,271
Operating Income	1,949	5,455	5,253	9,235
Capital and Other Expenditures [Abstract]
Capital Expenditures	1,260	1,031	2,476	2,216
Other Items	874	211	983	321
Global Construction & Agriculture \| Intersegment Revenues
Segment Reporting Information [Line Items]
Revenues	$ 2,657	$ 2,157	$ 4,609	$ 3,917

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Capital and Other Expenditures [Abstract]

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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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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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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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