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Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventory [Line Items]    
Finished goods $ 97,486 $ 57,297
Raw materials and components 60,269 53,388
Work in progress 20,929 18,422
Aftermarket parts 7,898 8,356
Used trailers 3,638 2,490
Total, Inventories $ 190,220 $ 139,953