Income Taxes (Components of Provision for Income Taxes) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 8,069us-gaap_CurrentFederalTaxExpenseBenefit	$ 5,477us-gaap_CurrentFederalTaxExpenseBenefit	$ 3,208us-gaap_CurrentFederalTaxExpenseBenefit
State	1,334	709	265
Foreign	3,883us-gaap_CurrentForeignTaxExpenseBenefit	2,032us-gaap_CurrentForeignTaxExpenseBenefit	2,352us-gaap_CurrentForeignTaxExpenseBenefit
Total Current	13,286us-gaap_CurrentIncomeTaxExpenseBenefit	8,218us-gaap_CurrentIncomeTaxExpenseBenefit	5,825us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	(42)	1,609	(2,031)
State	(1,626)	(1,144)	(291)
Foreign	191	504	673
Total Deferred	(1,477)ldl_DeferredIncomeTaxExpensesBenefits	969ldl_DeferredIncomeTaxExpensesBenefits	(1,649)ldl_DeferredIncomeTaxExpensesBenefits
Provision for income taxes	$ 11,809us-gaap_IncomeTaxExpenseBenefit	$ 9,187us-gaap_IncomeTaxExpenseBenefit	$ 4,176us-gaap_IncomeTaxExpenseBenefit

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