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Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Net Sales
Total Net Sales	$ 362,716	$ 447,676
Income (Loss) from operations	30,264	48,185
Assets	949,283	975,670	$ 898,733
External Customers
Net Sales
Total Net Sales	362,716	447,676
Intersegment Sales
Net Sales
Total Net Sales	0	0
Commercial Trailer Products
Net Sales
Total Net Sales	274,789	364,040
Income (Loss) from operations	33,392	50,257
Assets	323,001	386,598
Commercial Trailer Products | External Customers
Net Sales
Total Net Sales	274,750	364,031
Commercial Trailer Products | Intersegment Sales
Net Sales
Total Net Sales	39	9
Diversified Products
Net Sales
Total Net Sales	89,910	86,289
Income (Loss) from operations	4,604	6,990
Assets	375,338	396,092
Diversified Products | External Customers
Net Sales
Total Net Sales	87,966	83,645
Diversified Products | Intersegment Sales
Net Sales
Total Net Sales	1,944	2,644
Corporate and Eliminations
Net Sales
Total Net Sales	(1,983)	(2,653)
Income (Loss) from operations	(7,732)	(9,062)
Assets	250,944	192,980
Corporate and Eliminations | External Customers
Net Sales
Total Net Sales	0	0
Corporate and Eliminations | Intersegment Sales
Net Sales
Total Net Sales	$ (1,983)	$ (2,653)

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
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