Inventories - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Gross Tooling Inventory	$ 10.7ldl_GrossToolingInventory	$ 9.9ldl_GrossToolingInventory
Tooling inventory net of progress billings	$ 9.2	$ 8.8

The net amount of tooling inventory after the deduction of progress billings as of the balance sheet date.

No definition available.

Name:	ldl_ToolingInventoryNetOfProgressBillings
Namespace Prefix:	ldl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant