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Reportable Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net sales
Total net sales	$ 458,354	$ 439,977	$ 413,126	$ 324,229	$ 415,847	$ 405,917	$ 362,408	$ 277,682	$ 341,732	$ 336,433	$ 287,095	$ 221,984	$ 1,635,686	$ 1,461,854	$ 1,187,244
Depreciation and amortization													38,336	25,565	15,591
Income (Loss) from operations													103,191	70,484	19,790
Reconciling items to income before income taxes
Interest expense													26,308	21,724	4,136
Loss on debt extinguishment													1,889	0	668
Other, net													(2,629)	97	(227)
Income tax expense													31,094	(56,968)	171
Net income													77,623	48,663	15,213
External customers
Net sales
Total net sales													1,635,686	1,461,854	1,187,244
Intersegment sales
Net sales
Total net sales													0	0	0
Corporate and Eliminations
Net sales
Total net sales													(129,025)	(115,073)	(115,595)
Depreciation and amortization													1,860	2,812	2,821
Income (Loss) from operations													(15,987)	(29,576)	(13,101)
Corporate and Eliminations \| External customers
Net sales
Total net sales													0	0	0
Corporate and Eliminations \| Intersegment sales
Net sales
Total net sales													(129,025)	(115,073)	(115,595)
Commercial Trailer Products
Net sales
Total net sales													1,081,245	1,063,289	1,071,294
Depreciation and amortization													10,452	11,014	10,273
Income (Loss) from operations													51,485	47,314	18,536
Commercial Trailer Products \| External customers
Net sales
Total net sales													1,009,527	993,862	1,010,131
Commercial Trailer Products \| Intersegment sales
Net sales
Total net sales													71,718	69,427	61,163
Diversified Products
Net sales
Total net sales													501,980	355,993	106,480
Depreciation and amortization													23,995	11,029	1,866
Income (Loss) from operations													64,808	49,824	14,630
Diversified Products \| External customers
Net sales
Total net sales													446,013	310,982	52,048
Diversified Products \| Intersegment sales
Net sales
Total net sales													55,967	45,011	54,432
Retail
Net sales
Total net sales													181,486	157,645	125,065
Depreciation and amortization													2,029	710	631
Income (Loss) from operations													2,885	2,922	(275)
Retail \| External customers
Net sales
Total net sales													180,146	157,010	125,065
Retail \| Intersegment sales
Net sales
Total net sales													$ 1,340	$ 635	$ 0