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SEGMENTS - Major Product Categories and Percentage of Consolidated Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Product Information [Line Items]
Net sales	$ 610,196	$ 553,073	$ 612,690	$ 491,319	$ 543,444	$ 425,098	$ 435,903	$ 362,716	$ 462,057	$ 464,272	$ 471,439	$ 447,676	$ 2,267,278	$ 1,767,161	$ 1,845,444
Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													100.00%	100.00%	100.00%
Corporate and Eliminations
Product Information [Line Items]
Net sales													$ (21,881)	$ (13,040)	$ (13,070)
Commercial Trailer Products
Product Information [Line Items]
Net sales													1,536,687	1,348,251	1,506,070
Commercial Trailer Products | Operating Segments
Product Information [Line Items]
Net sales													1,536,939	1,348,382	1,506,110
Commercial Trailer Products | Corporate and Eliminations
Product Information [Line Items]
Net sales													(252)	(131)	(40)
Diversified Products
Product Information [Line Items]
Net sales													372,342	348,449	339,374
Diversified Products | Operating Segments
Product Information [Line Items]
Net sales													393,971	361,358	352,404
Diversified Products | Corporate and Eliminations
Product Information [Line Items]
Net sales													(21,629)	(12,909)	(13,030)
Final Mile Products
Product Information [Line Items]
Net sales													358,249	70,461	0
Final Mile Products | Operating Segments
Product Information [Line Items]
Net sales													358,249	70,461	0
Final Mile Products | Corporate and Eliminations
Product Information [Line Items]
Net sales													0	0	0
New trailers
Product Information [Line Items]
Net sales													$ 1,638,373	$ 1,413,689	$ 1,551,136
New trailers | Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													72.20%	80.00%	84.10%
New trailers | Corporate and Eliminations
Product Information [Line Items]
Net sales													$ 0	$ 0	$ (89)
New trailers | Commercial Trailer Products | Operating Segments
Product Information [Line Items]
Net sales													1,473,583	1,273,584	1,421,586
New trailers | Diversified Products | Operating Segments
Product Information [Line Items]
Net sales													164,790	140,105	129,639
New trailers | Final Mile Products | Operating Segments
Product Information [Line Items]
Net sales													0	0	0
Used trailers
Product Information [Line Items]
Net sales													$ 13,132	$ 13,998	$ 15,174
Used trailers | Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													0.60%	0.80%	0.80%
Used trailers | Corporate and Eliminations
Product Information [Line Items]
Net sales													$ 0	$ 0	$ 0
Used trailers | Commercial Trailer Products | Operating Segments
Product Information [Line Items]
Net sales													9,618	10,720	11,998
Used trailers | Diversified Products | Operating Segments
Product Information [Line Items]
Net sales													3,514	3,278	3,176
Used trailers | Final Mile Products | Operating Segments
Product Information [Line Items]
Net sales													0	0	0
Components, parts and service
Product Information [Line Items]
Net sales													$ 145,250	$ 154,526	$ 154,755
Components, parts and service | Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													6.40%	8.70%	8.40%
Components, parts and service | Corporate and Eliminations
Product Information [Line Items]
Net sales													$ (21,811)	$ (13,040)	$ (12,955)
Components, parts and service | Commercial Trailer Products | Operating Segments
Product Information [Line Items]
Net sales													34,994	48,008	56,191
Components, parts and service | Diversified Products | Operating Segments
Product Information [Line Items]
Net sales													122,099	117,681	111,519
Components, parts and service | Final Mile Products | Operating Segments
Product Information [Line Items]
Net sales													9,968	1,877	0
Equipment and other
Product Information [Line Items]
Net sales													$ 470,523	$ 184,948	$ 124,379
Equipment and other | Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													20.80%	10.50%	6.70%
Equipment and other | Corporate and Eliminations
Product Information [Line Items]
Net sales													$ (70)		$ (26)
Equipment and other | Commercial Trailer Products | Operating Segments
Product Information [Line Items]
Net sales													18,744	16,070	16,335
Equipment and other | Diversified Products | Operating Segments
Product Information [Line Items]
Net sales													103,568	100,294	108,070
Equipment and other | Final Mile Products | Operating Segments
Product Information [Line Items]
Net sales													$ 348,281	$ 68,584	$ 0

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