Reportable Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Net sales
External customers	$ 362,408	$ 287,095	$ 640,090	$ 509,079
Total net sales	362,408	287,095	640,090	509,079
Income (Loss) from operations	8,568	5,117	14,017	9,126
Assets	861,539	406,704	861,539	406,704	388,050
Commercial Trailer Products
Net sales
External customers	263,350	236,955	496,910	422,635
Intersegment sales	17,380	15,776	27,200	30,164
Total net sales	280,730	252,731	524,110	452,799
Income (Loss) from operations	13,735	3,329	19,922	8,884
Assets	648,606	291,573	648,606	291,573
Diversified Products
Net sales
External customers	65,712	13,745	84,714	23,353
Intersegment sales	10,802	13,428	23,390	23,899
Total net sales	76,514	27,173	108,104	47,252
Income (Loss) from operations	9,860	4,576	15,244	7,241
Assets	496,300	50,195	496,300	50,195
Retail
Net sales
External customers	33,346	36,395	58,466	63,091
Total net sales	33,346	36,395	58,466	63,091
Income (Loss) from operations	452	(4)	377	(131)
Assets	142,321	101,408	142,321	101,408
Corporate and Eliminations
Net sales
Intersegment sales	(28,182)	(29,204)	(50,590)	(54,063)
Total net sales	(28,182)	(29,204)	(50,590)	(54,063)
Income (Loss) from operations	(15,479)	(2,784)	(21,526)	(6,868)
Assets	$ (425,688)	$ (36,472)	$ (425,688)	$ (36,472)