SEGMENTS - Major Product Categories and Percentage of Consolidated Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Product Information [Line Items]
Net sales	$ 546,761	$ 392,003
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	$ (2,012)	$ (1,711)
Transportation Solutions
Product Information [Line Items]
Net sales	501,040	344,338
Transportation Solutions | Operating Segments
Product Information [Line Items]
Net sales	502,065	345,119
Transportation Solutions | Eliminations
Product Information [Line Items]
Net sales	1,025	781
Parts & Services
Product Information [Line Items]
Net sales	45,721	47,665
Parts & Services | Operating Segments
Product Information [Line Items]
Net sales	46,708	48,595
Parts & Services | Eliminations
Product Information [Line Items]
Net sales	987	930
New trailers
Product Information [Line Items]
Net sales	$ 437,706	$ 268,931
New trailers | Sales Revenue, Net | Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	80.10%	68.60%
New trailers | Eliminations
Product Information [Line Items]
Net sales	$ (311)	$ 0
New trailers | Transportation Solutions | Operating Segments
Product Information [Line Items]
Net sales	437,963	268,931
New trailers | Parts & Services | Operating Segments
Product Information [Line Items]
Net sales	54	0
Used trailers
Product Information [Line Items]
Net sales	$ 569	$ 1,012
Used trailers | Sales Revenue, Net | Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	0.10%	0.30%
Used trailers | Eliminations
Product Information [Line Items]
Net sales	$ 0	$ 0
Used trailers | Transportation Solutions | Operating Segments
Product Information [Line Items]
Net sales	0	165
Used trailers | Parts & Services | Operating Segments
Product Information [Line Items]
Net sales	569	847
Components, parts and services
Product Information [Line Items]
Net sales	$ 31,863	$ 33,787
Components, parts and services | Sales Revenue, Net | Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	5.80%	8.60%
Components, parts and services | Eliminations
Product Information [Line Items]
Net sales	$ (1,701)	$ (1,711)
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	33,564	35,498
Equipment and other
Product Information [Line Items]
Net sales	$ 76,623	$ 88,273
Equipment and other | Sales Revenue, Net | Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	14.00%	22.50%
Equipment and other | Eliminations
Product Information [Line Items]
Net sales	$ 0	$ 0
Equipment and other | Transportation Solutions | Operating Segments
Product Information [Line Items]
Net sales	64,102	76,023
Equipment and other | Parts & Services | Operating Segments
Product Information [Line Items]
Net sales	$ 12,521	$ 12,250