Changes in accumulated other comprehensive income (loss) - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014
Actuarial gains losses, net of tax	$ 0.1

Amount after tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement.

No definition available.

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Namespace Prefix:	ldl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration