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Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory [Line Items]    
Raw materials and components $ 104,797 $ 83,834
Finished goods 101,490 54,000
Work in progress 18,281 29,123
Aftermarket parts 6,468 6,448
Used trailers 1,414 7,330
Total, Inventories $ 232,450 $ 180,735