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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in the Carrying Amounts of Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]        
Goodwill, gross at beginning of period     $ 319,127 $ 150,030
Accumulated impairment losses at beginning of period     (1,663) (1,663)
Goodwill at beginning of period     317,464 148,367
Acquisition of Supreme     (1,520) (169,235)
Effects of foreign currency     84 (138)
Impairment of goodwill $ (4,900)   (4,944) 0
Goodwill, gross at end of period     317,691 319,127
Accumulated impairment losses at end of period     (6,607) (1,663)
Goodwill at end of period     311,084 317,464
Commercial Trailer Products        
Goodwill [Roll Forward]        
Goodwill, gross at beginning of period     4,288 4,288
Accumulated impairment losses at beginning of period     (1,663) (1,663)
Goodwill at beginning of period     2,625 2,625
Acquisition of Supreme     0 0
Effects of foreign currency     0 0
Impairment of goodwill   $ (1,700) 0 0
Goodwill, gross at end of period     4,288 4,288
Accumulated impairment losses at end of period     (1,663) (1,663)
Goodwill at end of period     2,625 2,625
Diversified Products        
Goodwill [Roll Forward]        
Goodwill, gross at beginning of period     145,604 145,742
Accumulated impairment losses at beginning of period     0 0
Goodwill at beginning of period     145,604 145,742
Acquisition of Supreme     0 0
Effects of foreign currency     84 (138)
Impairment of goodwill $ (4,900)   (4,944) 0
Goodwill, gross at end of period     145,688 145,604
Accumulated impairment losses at end of period     (4,944) 0
Goodwill at end of period     140,744 145,604
Final Mile Products        
Goodwill [Roll Forward]        
Goodwill, gross at beginning of period     169,235 0
Accumulated impairment losses at beginning of period     0 0
Goodwill at beginning of period     169,235 0
Acquisition of Supreme     (1,520) (169,235)
Effects of foreign currency     0 0
Impairment of goodwill     0 0
Goodwill, gross at end of period     167,715 169,235
Accumulated impairment losses at end of period     0 0
Goodwill at end of period     $ 167,715 $ 169,235