SEGMENTS - Major Product Categories and Percentage of Consolidated Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Product Information [Line Items]
Net sales	$ 655,150	$ 482,566	$ 1,844,680	$ 1,323,991
Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	100.00%	100.00%	100.00%	100.00%
Eliminations
Product Information [Line Items]
Net sales	$ (3,357)	$ (1,973)	$ (8,977)	$ (5,205)
Transportation Solutions
Product Information [Line Items]
Net sales	609,490	441,258	1,703,655	1,186,909
Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	611,779	442,636	1,709,826	1,190,173
Transportation Solutions \| Eliminations
Product Information [Line Items]
Net sales	2,289	1,378	6,171	3,264
Parts & Services
Product Information [Line Items]
Net sales	45,660	41,308	141,025	137,082
Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	46,728	41,903	143,831	139,023
Parts & Services \| Eliminations
Product Information [Line Items]
Net sales	1,068	595	2,806	1,941
New trailers
Product Information [Line Items]
Net sales	$ 530,508	$ 375,430	$ 1,476,471	$ 966,193
New trailers \| Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	81.00%	77.80%	80.00%	73.00%
New trailers \| Eliminations
Product Information [Line Items]
Net sales	$ (301)	$ 0	$ (973)	$ 0
New trailers \| Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	529,659	375,430	1,476,052	966,193
New trailers \| Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	1,150	0	1,392	0
Used trailers
Product Information [Line Items]
Net sales	$ 693	$ 465	$ 2,382	$ 1,855
Used trailers \| Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	0.10%	0.10%	0.10%	0.10%
Used trailers \| Eliminations
Product Information [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0
Used trailers \| Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	0	0	0	165
Used trailers \| Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	693	465	2,382	1,690
Components, parts and services
Product Information [Line Items]
Net sales	$ 34,171	$ 31,974	$ 105,208	$ 101,747
Components, parts and services \| Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	5.20%	6.60%	5.70%	7.70%
Components, parts and services \| Eliminations
Product Information [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0
Components, parts and services \| Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	0	0	0	0
Components, parts and services \| Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	34,171	31,974	105,208	101,747
Equipment and other
Product Information [Line Items]
Net sales	$ 89,778	$ 74,697	$ 260,619	$ 254,196
Equipment and other \| Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	13.70%	15.50%	14.10%	19.20%
Equipment and other \| Eliminations
Product Information [Line Items]
Net sales	$ (3,056)	$ (1,973)	$ (8,004)	$ (5,205)
Equipment and other \| Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	82,120	67,206	233,774	223,815
Equipment and other \| Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	$ 10,714	$ 9,464	$ 34,849	$ 35,586