SEGMENTS - Major Product Categories and Percentage of Consolidated Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Product Information [Line Items]
Net sales	$ 479,277	$ 482,566	$ 449,422	$ 392,003	$ 404,078	$ 351,584	$ 339,153	$ 387,074	$ 579,001	$ 580,908	$ 626,053	$ 533,174	$ 1,803,268	$ 1,481,889	$ 2,319,136
New trailers
Product Information [Line Items]
Net sales													1,354,373	1,087,820	1,662,679
Used trailers
Product Information [Line Items]
Net sales													2,514	8,386	2,479
Components, parts and services
Product Information [Line Items]
Net sales													131,929	123,517	155,104
Equipment and other
Product Information [Line Items]
Net sales													314,452	262,166	498,874
Transportation Solutions
Product Information [Line Items]
Net sales													1,628,694	1,308,935	2,103,955
Parts & Services
Product Information [Line Items]
Net sales													174,574	172,954	215,181
Operating Segments \| Transportation Solutions
Product Information [Line Items]
Net sales													1,633,319	1,315,429	2,114,809
Operating Segments \| Transportation Solutions \| New trailers
Product Information [Line Items]
Net sales													1,354,375	1,087,978	1,661,897
Operating Segments \| Transportation Solutions \| Used trailers
Product Information [Line Items]
Net sales													165	3,677	85
Operating Segments \| Transportation Solutions \| Components, parts and services
Product Information [Line Items]
Net sales													0	0	0
Operating Segments \| Transportation Solutions \| Equipment and other
Product Information [Line Items]
Net sales													278,779	223,774	452,827
Operating Segments \| Parts & Services
Product Information [Line Items]
Net sales													177,166	179,474	226,019
Operating Segments \| Parts & Services \| New trailers
Product Information [Line Items]
Net sales													179	3,387	7,859
Operating Segments \| Parts & Services \| Used trailers
Product Information [Line Items]
Net sales													2,349	4,709	2,394
Operating Segments \| Parts & Services \| Components, parts and services
Product Information [Line Items]
Net sales													131,929	123,517	155,104
Operating Segments \| Parts & Services \| Equipment and other
Product Information [Line Items]
Net sales													42,709	47,861	60,662
Corporate and Eliminations
Product Information [Line Items]
Net sales													(7,217)	(13,014)	(21,692)
Corporate and Eliminations \| New trailers
Product Information [Line Items]
Net sales													(181)	(3,545)	(7,077)
Corporate and Eliminations \| Used trailers
Product Information [Line Items]
Net sales													0	0	0
Corporate and Eliminations \| Components, parts and services
Product Information [Line Items]
Net sales													0	0	0
Corporate and Eliminations \| Equipment and other
Product Information [Line Items]
Net sales													(7,036)	(9,469)	(14,615)
Corporate and Eliminations \| Transportation Solutions
Product Information [Line Items]
Net sales													4,625	6,494	10,854
Corporate and Eliminations \| Parts & Services
Product Information [Line Items]
Net sales													$ 2,592	$ 6,520	$ 10,838
Product Concentration Risk \| Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													100.00%	100.00%	100.00%
Product Concentration Risk \| New trailers \| Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													75.20%	73.40%	71.60%
Product Concentration Risk \| Used trailers \| Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													0.10%	0.60%	0.10%
Product Concentration Risk \| Components, parts and services \| Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													7.30%	8.30%	6.70%
Product Concentration Risk \| Equipment and other \| Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													17.40%	17.70%	21.50%