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Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net Sales
Total Net Sales	$ 531,350	$ 491,697	$ 1,483,778	$ 1,335,838
Income (Loss) from operations	56,389	34,929	125,706	88,249
Reconciling items to income before income taxes
Interest Expense	(4,784)	(5,454)	(14,759)	(16,904)
Other, net	(187)	(610)	2,500	(1,626)
Income before income taxes	51,418	28,865	113,447	69,719
External Customers
Net Sales
Total Net Sales	531,350	491,697	1,483,778	1,335,838
Intersegment Sales
Net Sales
Total Net Sales	0	0	0	0
Commercial Trailer Products
Net Sales
Total Net Sales	387,032	351,951	1,096,054	915,845
Income (Loss) from operations	45,610	25,166	107,394	55,948
Commercial Trailer Products | External Customers
Net Sales
Total Net Sales	372,690	334,180	1,041,510	860,964
Commercial Trailer Products | Intersegment Sales
Net Sales
Total Net Sales	14,342	17,771	54,544	54,881
Diversified Products
Net Sales
Total Net Sales	120,219	115,838	322,148	343,235
Income (Loss) from operations	16,789	13,071	36,383	40,643
Diversified Products | External Customers
Net Sales
Total Net Sales	116,953	112,553	312,509	333,184
Diversified Products | Intersegment Sales
Net Sales
Total Net Sales	3,266	3,285	9,639	10,051
Retail
Net Sales
Total Net Sales	41,911	45,166	130,515	142,386
Income (Loss) from operations	1,322	859	3,811	3,190
Retail | External Customers
Net Sales
Total Net Sales	41,707	44,964	129,759	141,690
Retail | Intersegment Sales
Net Sales
Total Net Sales	204	202	756	696
Corporate and Eliminations
Net Sales
Total Net Sales	(17,812)	(21,258)	(64,939)	(65,628)
Income (Loss) from operations	(7,332)	(4,167)	(21,882)	(11,532)
Corporate and Eliminations | External Customers
Net Sales
Total Net Sales	0	0	0	0
Corporate and Eliminations | Intersegment Sales
Net Sales
Total Net Sales	$ (17,812)	$ (21,258)	$ (64,939)	$ (65,628)

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