SEGMENTS - Major Product Categories and Percentage of Consolidated Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Product Information [Line Items]
Net sales	$ 596,100	$ 632,828	$ 686,620	$ 620,952	$ 657,449	$ 655,150	$ 642,769	$ 546,761	$ 479,277	$ 482,566	$ 449,422	$ 392,003	$ 2,536,500	$ 2,502,129	$ 1,803,268
New trailers
Product Information [Line Items]
Net sales													1,918,799	2,012,864	1,354,373
Used trailers
Product Information [Line Items]
Net sales													4,978	2,905	2,514
Components, parts and services
Product Information [Line Items]
Net sales													148,256	139,762	131,929
Equipment and other
Product Information [Line Items]
Net sales													464,467	346,598	314,452
Transportation Solutions
Product Information [Line Items]
Net sales													2,320,274	2,312,637	1,628,694
Parts & Services
Product Information [Line Items]
Net sales													216,226	189,492	174,574
Operating Segments | Transportation Solutions
Product Information [Line Items]
Net sales													2,338,604	2,320,914	1,633,319
Operating Segments | Transportation Solutions | New trailers
Product Information [Line Items]
Net sales													1,924,700	2,012,428	1,354,375
Operating Segments | Transportation Solutions | Used trailers
Product Information [Line Items]
Net sales													0	0	165
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													413,904	308,486	278,779
Operating Segments | Parts & Services
Product Information [Line Items]
Net sales													220,873	193,476	177,166
Operating Segments | Parts & Services | New trailers
Product Information [Line Items]
Net sales													0	1,722	179
Operating Segments | Parts & Services | Used trailers
Product Information [Line Items]
Net sales													4,978	2,905	2,349
Operating Segments | Parts & Services | Components, parts and services
Product Information [Line Items]
Net sales													148,256	139,762	131,929
Operating Segments | Parts & Services | Equipment and other
Product Information [Line Items]
Net sales													67,639	49,087	42,709
Corporate and Eliminations
Product Information [Line Items]
Net sales													(22,977)	(12,261)	(7,217)
Corporate and Eliminations | New trailers
Product Information [Line Items]
Net sales													(5,901)	(1,286)	(181)
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													(17,076)	(10,975)	(7,036)
Corporate and Eliminations | Transportation Solutions
Product Information [Line Items]
Net sales													18,330	8,277	4,625
Corporate and Eliminations | Parts & Services
Product Information [Line Items]
Net sales													$ 4,647	$ 3,984	$ 2,592
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													75.70%	80.40%	75.00%
Product Concentration Risk | Used trailers | Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													0.20%	0.10%	0.10%
Product Concentration Risk | Components, parts and services | Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													5.80%	5.60%	7.30%
Product Concentration Risk | Equipment and other | Sales revenue, net
Product Information [Line Items]
Percentage of consolidated net sales													18.30%	13.90%	17.40%