SEGMENTS - Major Product Categories and Percentage of Consolidated Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Product Information [Line Items]
Net sales	$ 686,620	$ 642,769	$ 1,307,572	$ 1,189,530
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	$ (6,128)	$ (3,608)	$ (10,387)	$ (5,620)
Transportation Solutions
Product Information [Line Items]
Net sales	625,718	593,125	1,201,014	1,094,165
Transportation Solutions | Operating Segments
Product Information [Line Items]
Net sales	630,682	595,982	1,208,753	1,098,047
Transportation Solutions | Eliminations
Product Information [Line Items]
Net sales	(4,964)	(2,857)	7,739	3,882
Parts & Services
Product Information [Line Items]
Net sales	60,902	49,644	106,558	95,365
Parts & Services | Operating Segments
Product Information [Line Items]
Net sales	62,066	50,395	109,206	97,103
Parts & Services | Eliminations
Product Information [Line Items]
Net sales	(1,164)	(751)	2,648	1,738
New trailers
Product Information [Line Items]
Net sales	$ 521,535	$ 508,257	$ 1,006,421	$ 945,963
New trailers | Sales Revenue, Net | Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	76.00%	79.10%	77.00%	79.50%
New trailers | Eliminations
Product Information [Line Items]
Net sales	$ (2,002)	$ (361)	$ (2,364)	$ (672)
New trailers | Transportation Solutions | Operating Segments
Product Information [Line Items]
Net sales	523,537	508,430	1,008,785	946,393
New trailers | Parts & Services | Operating Segments
Product Information [Line Items]
Net sales	0	188	0	242
Used trailers
Product Information [Line Items]
Net sales	$ 517	$ 1,120	$ 1,056	$ 1,689
Used trailers | Sales Revenue, Net | Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	0.10%	0.20%	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	0
Used trailers | Parts & Services | Operating Segments
Product Information [Line Items]
Net sales	517	1,120	1,056	1,689
Components, parts and services
Product Information [Line Items]
Net sales	$ 39,794	$ 37,473	$ 75,476	$ 71,037
Components, parts and services | Sales Revenue, Net | Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	5.80%	5.80%	5.80%	6.00%
Components, parts and services | Eliminations
Product Information [Line Items]
Net sales	$ 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	39,794	37,473	75,476	71,037
Equipment and other
Product Information [Line Items]
Net sales	$ 124,774	$ 95,919	$ 224,619	$ 170,841
Equipment and other | Sales Revenue, Net | Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	18.20%	14.90%	17.20%	14.40%
Equipment and other | Eliminations
Product Information [Line Items]
Net sales	$ (4,126)	$ (3,247)	$ (8,023)	$ (4,948)
Equipment and other | Transportation Solutions | Operating Segments
Product Information [Line Items]
Net sales	107,145	87,552	199,968	151,654
Equipment and other | Parts & Services | Operating Segments
Product Information [Line Items]
Net sales	$ 21,755	$ 11,614	$ 32,674	$ 24,135