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Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Net Sales
Total net sales	$ 553,073	$ 425,098	$ 1,657,082	$ 1,223,717
Income (Loss) from operations	16,513	26,591	88,209	95,523
Assets	1,350,207	1,379,127	1,350,207	1,379,127	$ 1,351,513
External Customers
Net Sales
Total net sales	553,073	425,098	1,657,082	1,223,717
Intersegment Sales
Net Sales
Total net sales	0	0	0	0
Commercial Trailer Products
Net Sales
Total net sales	368,342	339,492	1,098,271	962,421
Income (Loss) from operations	32,453	36,319	102,718	111,865
Assets	358,150	362,209	358,150	362,209
Commercial Trailer Products | External Customers
Net Sales
Total net sales	368,301	339,494	1,098,182	962,371
Commercial Trailer Products | Intersegment Sales
Net Sales
Total net sales	41	(2)	89	50
Diversified Products
Net Sales
Total net sales	102,361	88,850	291,649	269,587
Income (Loss) from operations	(6,346)	5,178	3,078	14,844
Assets	352,494	356,147	352,494	356,147
Diversified Products | External Customers
Net Sales
Total net sales	97,723	85,604	275,183	261,346
Diversified Products | Intersegment Sales
Net Sales
Total net sales	4,638	3,246	16,466	8,241
Final Mile Products
Net Sales
Total net sales	87,049	0	283,717	0
Income (Loss) from operations	(1,495)	0	9,372	0
Assets	475,934	0	475,934	0
Final Mile Products | External Customers
Net Sales
Total net sales	87,049	0	283,717	0
Final Mile Products | Intersegment Sales
Net Sales
Total net sales	0	0	0	0
Corporate and Eliminations
Net Sales
Total net sales	(4,679)	(3,244)	(16,555)	(8,291)
Income (Loss) from operations	(8,099)	(14,906)	(26,959)	(31,186)
Assets	163,629	660,771	163,629	660,771
Corporate and Eliminations | External Customers
Net Sales
Total net sales	0	0	0	0
Corporate and Eliminations | Intersegment Sales
Net Sales
Total net sales	$ (4,679)	$ (3,244)	$ (16,555)	$ (8,291)

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