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Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventory [Line Items]
Raw materials and components	$ 67,494	$ 57,187
Work in progress	22,166	24,849
Finished goods	120,931	82,930
Aftermarket parts	9,608	9,882
Used trailers	16,814	14,639
Total, Inventories	$ 237,013	$ 189,487

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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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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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