Debt Instrument, Covenant, Lender's Approval For Acquisition, Percentage

No definition available.

Name:	lmb_DebtInstrumentCovenantLendersApprovalForAcquisitionPercentage
Namespace Prefix:	lmb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument Liquidity of Loan Parties

+ References

No definition available.

+ Details

Name:	lmb_DebtInstrumentLiquidityofLoanParties
Namespace Prefix:	lmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument Non Refundable Waiver Fee

+ References

No definition available.

+ Details

Name:	lmb_DebtInstrumentNonRefundableWaiverFee
Namespace Prefix:	lmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

It represents percentage of leverage ratio

+ References

No definition available.

+ Details

Name:	lmb_LeverageRatio
Namespace Prefix:	lmb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Leverage Ratio Minimum Requirement

+ References

No definition available.

+ Details

Name:	lmb_LeverageRatioMinimumRequirement
Namespace Prefix:	lmb_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility Reserved Borrowing Capacity

+ References

No definition available.

+ Details

Name:	lmb_LineofCreditFacilityReservedBorrowingCapacity
Namespace Prefix:	lmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

+ Details

Name:	us-gaap_AmortizationOfFinancingCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
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

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=lmb_A2019ABLCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lmb_A2019ABLCreditAmendmentNumberOneandWaiverMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - 2019 ABL Agreement (Details) - USD ($)			1 Months Ended			12 Months Ended
Debt - 2019 ABL Agreement (Details) - USD ($)	Apr. 01, 2021	Oct. 01, 2019	Jul. 31, 2021	Mar. 31, 2020	Jun. 30, 2019	Dec. 31, 2020	Sep. 30, 2020	Aug. 31, 2020	Dec. 31, 2019	Nov. 30, 2019	Nov. 30, 2018
2019 ABL Credit Agreement
Debt Instrument [Line Items]
Basis spread over variable rate						3.00%
Leverage ratio		330.00%		425.00%	4.00%		285.00%	461.00%
Leverage ratio minimum requirement							4.00	4.00
Letters of credit						$ 3,400,000			$ 3,300,000
Debt issuance costs, net						900,000
Amortization of debt issuance costs						$ 300,000			$ 200,000
2019 ABL Credit Agreement \| Forecast
Debt Instrument [Line Items]
Leverage ratio	200.00%		1.75%
2019 ABL Credit Amendment Number One and Waiver
Debt Instrument [Line Items]
Leverage ratio		330.00%		425.00%
Lender's approval for acquisition, percentage						50.10%
Debt instrument, non refundable waiver fee						$ 7,500
2019 ABL Credit Amendment Number One and Waiver \| Forecast
Debt Instrument [Line Items]
Leverage ratio	200.00%
Minimum \| 2019 ABL Credit Agreement
Debt Instrument [Line Items]
Basis spread over variable rate						2.00%
Debt instrument, interest rate, stated percentage						3.00%
Line of credit facility, unused capacity, commitment fee percentage						0.25%
Minimum \| 2019 ABL Credit Amendment Number One and Waiver
Debt Instrument [Line Items]
Debt instrument, liquidity of loan parties										$ 10,000,000
Maximum \| 2019 ABL Credit Agreement
Debt Instrument [Line Items]
Basis spread over variable rate						2.50%
Debt instrument, interest rate, stated percentage						3.50%
Line of credit facility, unused capacity, commitment fee percentage						0.375%
LIBOR Rate \| 2019 ABL Credit Agreement
Debt Instrument [Line Items]
Basis spread over variable rate						2.00%
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity											$ 25,000,000.0
Revolving Credit Facility \| 2019 ABL Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 15,000,000.0
Line of credit facility, current borrowing capacity						14,000,000
Line of credit facility reserved borrowing capacity						$ 1,000,000.0