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Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Finished goods $ 121,805 $ 57,297
Raw materials and components 80,841 53,388
Work in progress 27,181 18,422
Used trailers 9,208 2,490
Aftermarket parts 6,639 8,356
Total, Inventories $ 245,674 $ 139,953