Segment Reporting Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016		Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 180,291		$ 220,303
Gross Profit	25,704		29,074
Depreciation and Amortization Expense	4,411		4,478
Selling, General & Administrative Expenses	16,790		17,540
Operating Income	8,580		11,198
Capital Expenditures	2,285		2,919
Other Items	888	[1]	679	[2]
Loss on sale of a manufacturing facility	(132)		(108)
External Revenues
Segment Reporting Information [Line Items]
Revenues	180,291		220,303
Corporate/ Other
Segment Reporting Information [Line Items]
Revenues	(1,980)		(3,649)
Gross Profit	(425)		(963)
Depreciation and Amortization Expense	856		738
Selling, General & Administrative Expenses	5,804		5,553
Operating Income	(6,229)		(6,516)
Capital Expenditures	196		323
Other Items	687	[1]	0	[2]
Asset write down	600
Severance costs	100
Global Truck & Bus
Segment Reporting Information [Line Items]
Revenues	116,502		145,905
Gross Profit	17,823		21,346
Depreciation and Amortization Expense	2,034		2,224
Selling, General & Administrative Expenses	6,495		6,946
Operating Income	11,029		14,100
Capital Expenditures	904		1,082
Other Items	91	[1]	679	[2]
Equipment transfer expense	100		700
Global Truck & Bus | External Revenues
Segment Reporting Information [Line Items]
Revenues	116,283		145,805
Global Truck & Bus | Intersegment Revenues
Segment Reporting Information [Line Items]
Revenues	219		100
Global Construction & Agriculture
Segment Reporting Information [Line Items]
Revenues	65,769		78,047
Gross Profit	8,306		8,691
Depreciation and Amortization Expense	1,521		1,516
Selling, General & Administrative Expenses	4,491		5,041
Operating Income	3,780		3,614
Capital Expenditures	1,185		1,514
Other Items	110	[1]	0	[2]
Equipment transfer expense	100
Global Construction & Agriculture | External Revenues
Segment Reporting Information [Line Items]
Revenues	64,008		74,498
Global Construction & Agriculture | Intersegment Revenues
Segment Reporting Information [Line Items]
Revenues	$ 1,761		$ 3,549

[1] Other items include costs associated with plant closures, including employee severance and retention costs, lease cancellation costs, building repairs and costs to transfer equipment of $0.1 million in each of the GTB and GCA Segments, and $0.6 million in corporate pertaining to a write down of an asset held for sale and $0.1 million in severance costs.

[2] Other items include costs associated with plant closures, including employee severance and retention costs, lease cancellation costs, building repairs and costs to transfer equipment of $0.7 million in the GTB Segment.