Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Inventory [Line Items]
Raw materials and components	$ 80,544	$ 54,699
Work in progress	30,757	20,749
Finished goods	128,019	82,673
Aftermarket parts	8,367	10,389
Used trailers	12,107	15,663
Total, Inventories	$ 259,794	$ 184,173