SEGMENTS - Major Product Categories and Percentage of Consolidated Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Product Information [Line Items]
Net sales	$ 620,952	$ 546,761
Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	100.00%	100.00%
Eliminations
Product Information [Line Items]
Net sales	$ (4,259)	$ (2,012)
Transportation Solutions
Product Information [Line Items]
Net sales	575,296	501,040
Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	578,071	502,065
Transportation Solutions \| Eliminations
Product Information [Line Items]
Net sales	(2,775)	(1,025)
Parts & Services
Product Information [Line Items]
Net sales	45,656	45,721
Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	47,140	46,708
Parts & Services \| Eliminations
Product Information [Line Items]
Net sales	(1,484)	(987)
New trailers
Product Information [Line Items]
Net sales	$ 485,010	$ 437,706
New trailers \| Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	78.10%	80.10%
New trailers \| Eliminations
Product Information [Line Items]
Net sales	$ (362)	$ (311)
New trailers \| Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	485,248	437,963
New trailers \| Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	124	54
Used trailers
Product Information [Line Items]
Net sales	$ 539	$ 569
Used trailers \| Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	0.10%	0.10%
Used trailers \| Eliminations
Product Information [Line Items]
Net sales	$ 0	$ 0
Used trailers \| Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	0	0
Used trailers \| Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	539	569
Components, parts and services
Product Information [Line Items]
Net sales	$ 35,682	$ 31,863
Components, parts and services \| Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	5.70%	5.80%
Components, parts and services \| Eliminations
Product Information [Line Items]
Net sales	$ 0	$ (1,701)
Components, parts and services \| Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	0	0
Components, parts and services \| Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	35,682	33,564
Equipment and other
Product Information [Line Items]
Net sales	$ 99,721	$ 76,623
Equipment and other \| Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	16.10%	14.00%
Equipment and other \| Eliminations
Product Information [Line Items]
Net sales	$ (3,897)	$ 0
Equipment and other \| Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	92,823	64,102
Equipment and other \| Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	$ 10,795	$ 12,521