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Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Inventory [Line Items]    
Finished goods $ 109,906 $ 68,923
Used trailers 10,402 12,783
Raw materials and components 69,843 63,847
Aftermarket parts 9,131 8,446
Work in progress 28,228 23,145
Total, Inventories $ 227,510 $ 177,144