Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Inventory [Line Items]
Raw materials and components	$ 76,498	$ 63,847
Work in progress	30,852	23,145
Finished goods	110,709	68,923
Aftermarket parts	9,423	8,446
Used trailers	16,688	12,783
Total, Inventories	$ 244,170	$ 177,144