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Reportable Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net Sales                              
Total net sales $ 543,444 $ 425,098 $ 435,903 $ 362,716 $ 462,057 $ 464,272 $ 471,439 $ 447,676 $ 543,711 $ 531,350 $ 514,831 $ 437,597 $ 1,767,161 $ 1,845,444 $ 2,027,489
Depreciation and amortization                         35,053 36,769 37,998
Income (Loss) from operations                         130,816 202,532 180,369
Reconciling items to net income                              
Interest expense                         (16,400) (15,663) (19,548)
Other, net                         8,122 (1,452) 2,490
Income tax expense                         11,116 65,984 59,022
Net income 49,357 $ 18,947 $ 22,945 $ 20,173 23,000 $ 33,378 $ 35,532 $ 27,523 33,286 $ 31,880 $ 28,649 $ 10,474 111,422 119,433 104,289
Assets 1,351,513       898,733       949,670       1,351,513 898,733 949,670
External Customers                              
Net Sales                              
Total net sales                         1,767,161 1,845,444 2,027,489
Intersegment Sales                              
Net Sales                              
Total net sales                         0 0 0
Commercial Trailer Products                              
Net Sales                              
Total net sales                         1,348,382 1,506,110 1,582,241
Depreciation and amortization                         9,975 12,345 12,674
Income (Loss) from operations                         151,999 212,351 159,385
Reconciling items to net income                              
Assets 311,705       312,848       336,235       311,705 312,848 336,235
Commercial Trailer Products | External Customers                              
Net Sales                              
Total net sales                         1,348,251 1,506,070 1,582,019
Commercial Trailer Products | Intersegment Sales                              
Net Sales                              
Total net sales                         131 40 222
Diversified Products                              
Net Sales                              
Total net sales                         361,358 352,404 456,927
Depreciation and amortization                         22,236 22,970 23,888
Income (Loss) from operations                         20,376 24,595 51,078
Reconciling items to net income                              
Assets 340,651       370,338       397,892       340,651 370,338 397,892
Diversified Products | External Customers                              
Net Sales                              
Total net sales                         348,449 339,374 445,470
Diversified Products | Intersegment Sales                              
Net Sales                              
Total net sales                         12,909 13,030 11,457
Final Mile Products                              
Net Sales                              
Total net sales                         70,461 0 0
Depreciation and amortization                         1,152 0 0
Income (Loss) from operations                         (2,098) 0 0
Reconciling items to net income                              
Assets 404,246       0       0       404,246 0 0
Final Mile Products | External Customers                              
Net Sales                              
Total net sales                         70,461 0 0
Final Mile Products | Intersegment Sales                              
Net Sales                              
Total net sales                         0 0 0
Corporate and Eliminations                              
Net Sales                              
Total net sales                         (13,040) (13,070) (11,679)
Depreciation and amortization                         1,690 1,454 1,436
Income (Loss) from operations                         (39,461) (34,414) (30,094)
Reconciling items to net income                              
Assets $ 294,911       $ 215,547       $ 215,543       294,911 215,547 215,543
Corporate and Eliminations | External Customers                              
Net Sales                              
Total net sales                         0 0 0
Corporate and Eliminations | Intersegment Sales                              
Net Sales                              
Total net sales                         $ (13,040) $ (13,070) $ (11,679)