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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory [Line Items]    
Raw materials and components $ 74,116 $ 54,699
Work in progress 24,040 20,749
Finished goods 136,619 82,673
Aftermarket parts 8,646 10,389
Used trailers 12,662 15,663
Total, Inventories $ 256,083 $ 184,173