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Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Inventory [Line Items]    
Finished goods $ 96,036 $ 67,260
Raw materials and components 60,013 65,790
Work in progress 26,725 18,201
Aftermarket parts 8,378 8,714
Used trailers 3,997 7,017
Total, Inventories $ 195,149 $ 166,982