Credit Facility Fixed Charge Coverage Ratio

No definition available.

Name:	ldl_CreditFacilityFixedChargeCoverageRatio
Namespace Prefix:	ldl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Earnings before Interest, Taxes, Depreciation and Amortization

+ References

No definition available.

+ Details

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

- Definition

Leverage Ratio

+ References

No definition available.

+ Details

Name:	ldl_LeverageRatio
Namespace Prefix:	ldl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Increased value of maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

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

- Definition

Maximum possible value of increase in maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ldl_DomesticCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=ldl_EurocurrencyRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=ldl_FederalFundsRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-term Debt and Financing Arrangements - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Feb. 18, 2014	Mar. 31, 2015	Dec. 31, 2014	Feb. 20, 2014
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 100,000,000		$ 100,000,000
Line of credit facility maximum borrowing capacity increased value	100,000,000
Line of credit facility maximum borrowing capacity possible value of increase	50,000,000
Credit facility fixed charge coverage ratio		2.0
Required consolidated leverage ratio as of end of each fiscal quarter		3.0ldl_LeverageRatio
Required Consolidated EBITDA		30,000,000.0
Line of credit facility, remaining borrowing capacity		57,700,000
Standby letters of credit, outstanding		2,300,000
Debt, Weighted Average Interest Rate		1.30%us-gaap_DebtWeightedAverageInterestRate	1.50%us-gaap_DebtWeightedAverageInterestRate
Federal Funds Effective Swap Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Minimum [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	35,000,000
Minimum [Member] \| Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.75%
Maximum [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	100,000,000
Maximum [Member] \| Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Domestic Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 35,000,000.0