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Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventory [Line Items]    
Raw materials and components $ 70,631 $ 65,790
Work in progress 22,271 18,201
Finished goods 98,608 67,260
Aftermarket parts 8,902 8,714
Used trailers 7,797 7,017
Total, Inventories $ 208,209 $ 166,982