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Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Inventory [Line Items]
Raw materials and components	$ 71,028	$ 54,000
Work in progress	34,017	2,332
Finished goods	110,037	115,095
Aftermarket parts	16,538	5,762
Used trailers	18,543	12,344
Inventories	$ 250,163	$ 189,533

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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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