Inventories - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Inventory [Line Items]
Gross Tooling Inventory	$ 8.0	$ 6.4
Tooling Inventory Net Of Progress Billings	$ 3.5	$ 3.7

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