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Cost of Manufactured Inventory Includes Raw Material, Labor and Overhead (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory [Line Items]    
Raw materials and components $ 63,847us-gaap_InventoryRawMaterialsNetOfReserves $ 54,699us-gaap_InventoryRawMaterialsNetOfReserves
Work in progress 23,145us-gaap_InventoryWorkInProcessNetOfReserves 20,749us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 68,923us-gaap_InventoryFinishedGoodsNetOfReserves 82,673us-gaap_InventoryFinishedGoodsNetOfReserves
Aftermarket parts 8,446us-gaap_InventoryPartsAndComponentsNetOfReserves 10,389us-gaap_InventoryPartsAndComponentsNetOfReserves
Used trailers 12,783us-gaap_OtherInventoryNetOfReserves 15,663us-gaap_OtherInventoryNetOfReserves
Total, Inventories $ 177,144us-gaap_InventoryNet $ 184,173us-gaap_InventoryNet