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Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventory [Line Items]
Raw materials and components	$ 76,584us-gaap_InventoryRawMaterialsNetOfReserves	$ 63,847us-gaap_InventoryRawMaterialsNetOfReserves
Work in progress	24,730us-gaap_InventoryWorkInProcessNetOfReserves	23,145us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods	111,776us-gaap_InventoryFinishedGoodsNetOfReserves	68,923us-gaap_InventoryFinishedGoodsNetOfReserves
Aftermarket parts	8,911us-gaap_InventoryPartsAndComponentsNetOfReserves	8,446us-gaap_InventoryPartsAndComponentsNetOfReserves
Used trailers	21,001us-gaap_OtherInventoryNetOfReserves	12,783us-gaap_OtherInventoryNetOfReserves
Total, Inventories	$ 243,002us-gaap_InventoryNet	$ 177,144us-gaap_InventoryNet

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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Carrying amount, net of valuation reserves and allowances, as of the balance sheet date of inventories not otherwise specified in the taxonomy.

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