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INVENTORIES - Summary of inventories, net of reserves (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Chassis	$ 7,790mlr_InventoryChassisNetOfReserves	$ 4,700mlr_InventoryChassisNetOfReserves
Raw materials	25,351	24,291
Work in process	10,400	10,477
Finished goods	18,232	16,992
Inventories	$ 61,773us-gaap_InventoryNet	$ 56,460us-gaap_InventoryNet

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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