Cost of Manufactured Inventory Includes Raw Material, Labor and Overhead (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Inventory [Line Items]
Finished goods	$ 57,297	$ 67,260
Raw materials and components	53,388	65,790
Work in progress	18,422	18,201
Aftermarket parts	8,356	8,714
Used trailers	2,490	7,017
Total, Inventories	$ 139,953	$ 166,982