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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Inventory [Line Items]    
Raw materials and components $ 61,837 $ 57,187
Work in progress 26,656 24,849
Finished goods 127,822 82,930
Aftermarket parts 10,802 9,882
Used trailers 12,489 14,639
Total, Inventories $ 239,606 $ 189,487